Instruction No. GF-114 AERCO INTERNATIONAL, Inc., Northvale, New Jersey, 07647 USA MODBUS ® Communication Manual For C-More Boiler Controllers and Boiler Management Systems (BMS/BMS II) ® Modbus is a registered trademark of AEG Modicon Printed in U.S.
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MODBUS COMMUNICATION MANUAL TABLE OF CONTENTS PARA. PAGE SECTION 1 – INTRODUCTION & GENERAL DESCRIPTION 1-1 1.1 INTRODUCTION 1-1 1.2 AERCO BMS AND C-MORE CONTROLLER MODELS COVERED 1-1 1.3 MINIMUM MODBUS SUPPORT REQUIREMENTS 1-2 1.3.1 Communication Medium 1-2 1.3.2 Address Support 1-3 1.3.3 Modbus Transmission Modes 1-3 1.3.4 Timing Specifications 1-3 1.4 MODBUS FUNCTION SET SUPPORT 1-4 1.5 EXCEPTION RESPONSES 1-4 1.
MODBUS COMMUNICATION MANUAL TABLE OF CONTENTS - Continued PARA. 3.3 PAGE BMS/BMS II STANDARD APPLICATION OPERATIONS 3-3 3.3.1 Password Protection For BMS/BMS II Input and Holding Register Access 3-3 3.3.2 Remote Setpoint Control of BMS/BMS II Slave By EMS Master 3-3 3.3.3 BMS/BMS II Master Control of C-More Slaves Via Network 3-4 3.3.4 BMS Combination Mode Boiler Controller of C-More Slaves 3-4 SECTION 4 – MODBUS NETWORK SETUP & INSTALLATION 4-1 4.1 INTRODUCTION 4-1 4.
MODBUS COMMUNICATION MANUAL TABLE OF CONTENTS - Continued PARA. PAGE SECTION 6 – MODBUS SOFTWARE SETUP – C-MORE & BMS II 6-1 6.1 INTRODUCTION 6-1 6.2 C-MORE BOILER CONTROLLER SETUP FOR MODBUS OPERATION 6-1 6.2.1 Modbus Monitoring and Configuration Control 6-2 6.2.2 Modbus Direct Drive Control and Monitoring 6-2 6.2.3 Modbus Remote Setpoint Control 6-2 BMS II SETUP FOR MODBUS OPERATION AS A SLAVE TO AN EMS 6-3 6.3.1 BMS II Monitoring and Configuration By An EMS Master 6-3 6.3.
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MODBUS COMMUNICATION MANUAL SECTION 1 INTRODUCTION & GENERAL DESCRIPTION 1.1 INTRODUCTION The information contained in this manual provides general guidelines for implementing a Modbus® communications network utilizing AERCO’s Boiler Management System (BMS) Model 168 or Boiler Management System II (BMS II) Model 5R5-384 and C-More Boiler Controllers.
MODBUS COMMUNICATION MANUAL 1.3 MINIMUM MODBUS SUPPORT REQUIREMENTS Implementation of a Modbus communication network utilizing the AERCO C-More Controller and BMS/BMS II will be limited to the minimum support requirements listed in Table 1-1 which follows. The remaining paragraphs in this Section provide more detailed descriptions for each of the items listed. Table 1-1.
MODBUS COMMUNICATION MANUAL 1.3.1.1 EMS Master To BMS/BMS II Slave The Modbus network connections between the EMS and BMS/BMS II will depend on the type of port provide on the EMS Master. If the EMS contains a RS232 port, a direct connection can be made directly to the BMS/BMS II RS232 port. For optimum results the wire length between the EMS and BMS/BMS II RS232 connection should not exceed 50 feet.
MODBUS COMMUNICATION MANUAL 1.4 MODBUS FUNCTION SET SUPPORT The complete Modbus protocol includes a total of 24 Function Codes. However, for AERCO BMS/BMS II and C-More Boiler Controllers, only the Codes listed in Table 1-2 are supported. The supported Diagnostic Sub-Function Codes associated with Diagnostic Function Code 08 are listed in Table 1-3. Table 1-2.
MODBUS COMMUNICATION MANUAL Table 1-4. Minimum Exception Code Set Exception Code Description Comments 01 Illegal Function The function code received is not valid or is not supported. 02 Illegal Data Address The data address received is invalid or is not accessible due to security setting. 03 Illegal Data Value The data value received is not valid 1.6 PHRASES, ABBREVIATIONS & ACRONYMS The phrases, abbreviations and acronyms used in this manual are listed in Table 1-5. Table 1-5.
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MODBUS COMMUNICATION MANUAL SECTION 2 STANDARD REGISTER ASSIGNMENTS 2.1 INTRODUCTION This Section provides the standard data register addresses assigned to the AERCO and CMore Boiler Controllers and the AERCO Boiler Management System (BMS/BMS II). These data registers consist of Input Registers and Holding Registers. All register addresses provided throughout this manual are expressed as hexadecimal numbers. 2.1.
MODBUS COMMUNICATION MANUAL 2.2 C-MORE BOILER CONTROLLER STANDARD REGISTER ASSIGNMENTS 2.2.1 C-More Boiler Controller Standard Input Register Assignments The Read Only Input Register addresses are listed in Table 2-1 which follows: Table 2-1.
MODBUS COMMUNICATION MANUAL Table 2-1.
MODBUS COMMUNICATION MANUAL Table 2-1.
MODBUS COMMUNICATION MANUAL 2.2.2 C-More Boiler Controller Standard Holding Register Assignments The Read/Write Input Register address assignments are listed in Table 2-2 which follows. Unless otherwise specified, all Holding Register menu items are Read/Write (R/W) Table 2-2.
MODBUS COMMUNICATION MANUAL Table 2-2. C-More Controller Standard Holding Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-2. C-More Controller Standard Holding Register Address Mapping-Cont. Modbus Data Address Decimal (Hex) Menu Item Units and Range Comments 24 (0x0018) Failsafe Mode enum (0, 1) 0=Shutdown 1=Constant Setpoint Default = 0 (Shutdown) 25 (0x0019) Low Fire Timer SEC_UNITS (2 to 60) 1count/sec Default = 2 sec. 26 (0x001A) Prop Band ABS_DEG_1 (0 to 1000) See Appendix A, Tables A-2 and A-3 for Conversions 27 (0x001B) Integral Gain 0.00 to 2.00 (0.
MODBUS COMMUNICATION MANUAL Table 2-2. C-More Controller Standard Holding Register Address Mapping-Cont. Modbus Data Address Decimal (Hex) Menu Item 67 (0x0043) Sensor Log Interval Enum (0 to 8) 0 = Off 1 = 1 Min. 2 = 5 Min. 3 = 15 Min. 4 = 30 Min. 5 = 1 Hr. 6 = 6 Hrs 7 = 12 Hrs. 8 = 24 Hrs.
MODBUS COMMUNICATION MANUAL 2.3 BMS/BMS II CONTROLLER STANDARD REGISTER ASSIGNMENTS 2.3.1 BMS/BMS II Controller Standard Input Register Assignments The Read Only Input Register address assignments for the BMS/BMS II are listed in Table 2-3 which follows: Table 2-3.
MODBUS COMMUNICATION MANUAL Table 2-3. BMS/BMS II Standard Input Register Address Mapping-Cont. Modbus Data Address Decimal (Hex) Menu Item Units and Range Comments 17 (0x0011) Boiler 1 Status (PWM Boiler 1) 119 = Not On-Line 120 = On-Line But Not Fired 1–40 = Fired & Sequence Boilers 1 - 8 are referred to as the Legacy (PWM) Boilers.
MODBUS COMMUNICATION MANUAL Table 2-3. BMS/BMS II Standard Input Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-3. BMS/BMS II Standard Input Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL 2.3.2 BMS/BMS II Controller Standard Holding Register Assignments The Holding Register address assignments for the BMS/BMS II are listed in Table 2-4 which follows. Unless otherwise specified, all Holding Register Menu items are Read/Write (R/W). Table 2-4.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping Modbus Data Address Decimal (Hex) Menu Item Units and Range Default/Comments 18 (0x0012) Derivative Gain -2.00 to 2.00 (0.00 increments) Default = 0.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping-Cont.
MODBUS COMMUNICATION MANUAL Table 2-4. BMS/BMS II Standard Holding Register Address Mapping-Cont. Modbus Data Address Decimal (Hex) Menu Item Units and Range Default/Comments 134 (0x0086) Fault Alarm Boilers 0 = No Blr Faults, 1 = All Blr Faults Default = 0 135 (0x0087) 4 to 20 mA Current Offset -1.00 to 1.00 mA Default = 0 (BMS II Only) 136 (0x0088) Return Sensor Offset -10.0 to 10.
MODBUS COMMUNICATION MANUAL SECTION 3 STANDARD APPLICATION OPERATIONS 3.1 INTRODUCTION This Section describes the standard application operations for AERCO C-More Boiler Controllers and the AERCO Boiler Management System (BMS/BMS II) and how they are achieved utilizing Modbus. Paragraphs 3.2 through 3.2.7 provide information for the C-More Boiler Controllers which can only function as Slaves in a Modbus Network. Paragraphs 3.3 through 3.3.
MODBUS COMMUNICATION MANUAL 3.2.2 Simultaneous RS232 & RS485 Access to C-More Controller Variables As previously mentioned, read and write access of the C-More Controller variables are protected from unauthorized access by an internal security level hierarchy.
MODBUS COMMUNICATION MANUAL 3.2.6 Physical Slave Address Zero Normally, each Modbus Network Slave Controller will be assigned its own unique Comm. Address (Input Register Address 0x0013). Valid entries are from 1 to 127. However, if the default address of 0 is assigned, the C-More Slave, will not respond or process any Modbus Network messages. This effectively disables the Slave’s Modbus communication link. 3.
MODBUS COMMUNICATION MANUAL 3.3.3 BMS/BMS II Master Control of C-More Slaves Via Network The BMS/BMS II can also communicate with the up to 32 Network C-MORE Boiler Control Slaves via the BMS RS485 port. Parallel and Sequential control can be selected as before. See BMS Manual GF-108M or BMS II Manual GF-124 for additional information. The “Number Of Network Boilers” must be entered at location 0x0059 in the Standard Holding Registers.
MODBUS COMMUNICATION MANUAL SECTION 4 MODBUS NETWORK HARDWARE SETUP & INSTALLATION 4.1 INTRODUCTION This Section provides basic information on planning and setup of a Modbus Communication Network utilizing AERCO C-More Boiler Controllers and Boiler Management Systems (BMS/ BMS II). It also provides basic information on Modbus Network setup utilizing AERCO BMS/ BMS II or C-More Slaves with a Master EMS (or BAS) provided by other manufacturers. 4.
MODBUS COMMUNICATION MANUAL Simplified block diagrams showing the internal and external connection options between the BMS and EMS are shown in Figure 4-3. Connector pinouts for the external RS232 (DB9Female) and internal RS232 connector are shown in Figure 4-4. In addition, Figure 4-4 shows the pin assignments for the internal RS485 connector mounted on the BMS terminal board. This connector is used to interface the boilers to the Modbus network.
MODBUS COMMUNICATION MANUAL BMS SLAVE EMS MASTER RS232 RS232 P/O MOTHERBOARD (50 FT. MAX.) JP6 JP5 RS232 PORT RS485 PORT TERMINAL BOARD RS232 IN NOTE: RS232 WIRING CAN BE CONNECTED TO EITHER THE EXTERNAL DB9 PORT OR THE INTERNAL RS232 CONNECTOR, BUT NOT BOTH RS485 OUT (4000 FT. MAX.) RS485 TO BOILERS EMS RS232 PORT TO BMS RS232 PORT BMS SLAVE EMS MASTER (1) RS485-TORS232 CONVERTER (2) RS232 RS485 P/O MOTHERBOARD JP6 JP5 RS232 PORT RS485 PORT (1) = 4000 FT. MAX. (2) = 50 FT. MAX.
MODBUS COMMUNICATION MANUAL BMS SLAVE EMS MASTER RS485 RS232 P/O MOTHERBOARD JP6 JP5 RS232 PORT RS485 PORT TERMINAL BOARD RS232 IN RS485 OUT RS485-TORS232 CONVERTER (4000 FT. MAX.) (4000 FT. MAX.) RS485 TO BOILERS EMS RS485 PORT TO BMS RS232 PORT USING INTERNAL CONVERTER Figure 4-3.
MODBUS COMMUNICATION MANUAL PIN 2 RxD PIN 3 TxD PIN 5 GND 5 1 6 9 DB9 (FEMALE) EXTERNAL RS232 PORT RS485 TO BLRS +(B) -(A) JP12 JP11 NOT USED SHLD RS485 PORT RS232 RXD TXD GND RS232 PORT INTERNAL RS485 & RS232 PORTS Figure 4-4. BMS RS232 & RS485 Connectors 4.2.2 BMS II Slave To EMS Master Wiring Connections Wiring connections between an EMS Master and an AERCO BMS II Slave are made at the internal RS232 port terminals behind the wiring compartment cover of the BMS II.
MODBUS COMMUNICATION MANUAL SENSORS & 4-20 mA INTERLOCKS & SETBACK RS485 & RS232 (SEE DETAIL “A”) RELAYS AC POWER DETAIL “A” Figure 4-5.
MODBUS COMMUNICATION MANUAL EMS MASTER (50 FT. MAX.) RS232 BMS II SLAVE RS485 PORT RS232 PORT PART OF BMS II MOTHERBOARD 4000 FT. MAX. RS485 SIGNALING TO/FROM NETWORK BOILERS EMS RS232 PORT TO BMS RS232 PORT EMS MASTER RS485 4000 FT. MAX. RS485 TO RS232 CONVERTER 50 FT. MAX. BMS II SLAVE RS232 PORT RS485 PORT PART OF BMS II MOTHERBOARD 4000 FT. MAX. RS485 SIGNALING TO/FROM NETWORK BOILERS EMS RS485 PORT TO BMS RS232 PORT USING EXTERNAL CONVERTER Figure 4-6.
MODBUS COMMUNICATION MANUAL EMS MASTER (4000 FT. MAX.) RS485 BMS II SLAVE RS485 TO RS232 CONVERTER RS232 PORT RS485 PORT (4000 FT. MAX.) RS485 SIGNALING TO NETWORK BOILERS PART OF BMS II MOTHERBOARD EMS TO BMS II WITH INTERNAL RS485-TO-RS232 CONVERTER Figure 4-6. EMS Master To BMS II Slave Connection Diagrams (Sheet 2 of 2) 4.2.
MODBUS COMMUNICATION MANUAL KC1000 BENCHMARK OUTDOOR SENSOR IN SENSOR COMMON AUX SENSOR IN REMOTE INTL'K IN EXHAUST SWITCH IN DELAYED INTL'K IN NOT USED NOT USED NC COM NO + ANALOG IN+ B.M.S. (PWM) IN - NC COM NO RS-485 COMM. AUX RELAY 120 VAC, 5A, RES NOT USED SHIELD mA OUT FAULT RELAY 120 VAC, 5A, RES NOTE DO NOT TERMINATE THE SHIELDS OF THE RS485 LEADS TO THE GROUND (G) TERMINAL. THE SHIELDS MUST BE TERMINATED AT THE SOURCE ENDS ONLY.
MODBUS COMMUNICATION MANUAL 4.2.4 C-More Slaves To BMS/BMS II or EMS Master Wiring connections between a BMS/BMS II Master and up to 32 Network C-More Boiler Controller Slaves are made directly between the BMS/BMS II internal RS485 terminals (Figure 4-4 or 4-5) and the RS485 COMM terminals in each Boiler’s I/O Box (Figure 4-7). If a third-party EMS Master is used in place of the BMS/BMS II, the Modbus Network connections will depend on the available communication port(s) on the EMS.
MODBUS COMMUNICATION MANUAL CAUTION The C-More Boiler Controller Printed Circuit Boards contain electronic components that are sensitive to electrostatic discharge (ESD). Prior to performing the following steps, put on an anti-static wrist strap and connect the clip lead to earth ground. Failure to observe this precaution may result in permanent damage to on-board ESD-sensitive components. 4. Put on an anti-static wrist strap and attach the clip lead to earth ground. 5.
MODBUS COMMUNICATION MANUAL RS485 DIP SW.
MODBUS COMMUNICATION MANUAL RIBBON CABLE CONNECTOR (J1) SEE DETAIL “A” CBS1 R49 BIAS2 TERM BIAS1 RS485 RX TX R55 C40 R50 C38 R52 U7 C39 S2 U8 R1 R46 C36 R81 C37 R53 U6 C9 R9 J3 U2 R44 R45 C7 R4 R62 U3 R51 C13 R10 C12 R47 R48 R3 R6 B1 Y2 HB U21 C5 R75 C6 C1 JP2 CR1 R76 R77 C43 R65 C16 C19 C29 C31 C28 C55 R70 C23 C22 R24 R25 R26 R28 C18 C26 R27 U4 C34 R18 C20 R15 C17 C44 R16 U18 C45 C33 R42 R43 R41 R40 R39 C35 C32 C27 R32 R14 R17 C63 R61 R59 C42 R60 U5
MODBUS COMMUNICATION MANUAL 4.4 MODBUS NETWORK WIRING DIAGRAMS Sample Modbus Network wiring diagrams for the basic circuit configurations are provided in paragraphs 4.4.1 through 4.4.3. It should be noted that these diagrams are only intended as a guide and do not include all possible scenarios. If a third-party EMS is being utilized, refer to the manufacturer’s manual prior to attempting any network wiring connections.
RS485 PORT 4-15 (SEE NOTE 2) GND Rx Tx DETAIL “A” SHIELD R- R+ T- T+ J2P PWM TERMINALS T-/R- T+/R+ BLR 8 Figure 4-11. EMS Master Controlling BMS Slave 2. RS485-TO-RS232 CONVERTER NOT REQUIRED IF EMS MASTER CONTAINS RS232 PORT. EMS CAN BE DIRECTLY CONNECTED TO BMS. 1.
4-16 RS232 PORT - - BLR 8 + SHIELD A- B+ P/O I/O BOX + RS485 - COMM C-MORE SLAVE THE LAST C-MORE SLAVE ON THE RS485 LOOP MUST HAVE ITS TERMINATION RESISTOR (TERM) AND BIAS (BIAS1, BIAS2) DIP SWITCHES TURNED ON. NOTE TO OTHER NETWORK BOILERS (3 – 32) C-MORE SLAVE NETWORK BOILER 2 P/O I/O BOX + RS485 COMM - NETWORK BOILER 1 Figure 4-12.
RS485 PORT T-/RSHIELD T+/R+ 4-17 P/O I/O BOX + RS485 - COMM TO OTHER NETWORK BOILERS (3 – 32) (SEE NOTE 3) C-MORE SLAVE C-MORE SLAVE NETWORK BOILER 2 P/O I/O BOX + RS485 COMM - NETWORK BOILER 1 Figure 4-13. EMS Master Controlling C-More Slaves 3. THE LAST C-MORE SLAVE ON THE RS485 LOOP MUST HAVE ITS TERMINATION RESISTOR (TERM) TURNED ON. ALSO, BIAS (BIAS1, BIAS2) MAY BE REQUIRED. CHECK WITH THE EMS MANUFACTURER. 2.
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MODBUS COMMUNICATION MANUAL SECTION 5 MODBUS SOFTWARE SETUP NOTE Section 5 provides Modbus Software Setup information for BMS (Model 168) units only. Refer to Section 6 for Modbus Software Setup information for BMS II Model 5R5-384 units. NOTE The BMS includes a Modbus Pass-Thru function which permits an EMS to monitor and configure the boilers on the Modbus network. However, it does not permit the EMS to directly control the boilers.
MODBUS COMMUNICATION MANUAL 5.2.1 Monitoring and Configuration Control In order for the C-More Boiler Controller to be recognized by the Modbus Master, a valid Network Comm Address must be entered in the Setup Menu as follows: NOTE A C-More Boiler Controller can be monitored or configured on the Modbus Network regardless of its mode of control. 1. Scroll through the Setup Menu until Comm Address is displayed. 2. With Comm Address displayed, press the CHANGE key. 3.
MODBUS COMMUNICATION MANUAL MENU OPTION SETTING Boiler Mode Remote Setpoint Remote Signal Network 3. The C-More Controller is now set for Remote Setpoint operation via the Modbus Network. 4. AERCO recommends that the Setpoint Limiting feature in the Configuration Menu be enabled. Also, ensure that the Failsafe Mode setting is set to the desired setting (Shutdown or Constant Setpoint) in the event that the Modbus Network signal is lost.
MODBUS COMMUNICATION MANUAL The BMS is now set up to be monitored or configured on the Modbus Network. Remember that the configuration can only be changed on the Modbus Network by first entering a valid password for PASSWORD LO and PASSWORD HI. 5.3.2 BMS Modbus Remote Setpoint Control By An EMS Master To configure the BMS for Remote Setpoint Control from an EMS Master, proceed as follows: 1. Press the FIELD ADJ key on the BMS front panel to enter the Field Adjust Mode.
MODBUS COMMUNICATION MANUAL 5.4 BMS SETUP AS MASTER TO C-MORE BOILER CONTROLLERS To set up the BMS as a Master to Control C-More Boiler Slaves, proceed as follows: 1. Press the FIELD ADJ key on the BMS front panel to enter the Field Adjust Mode. The yellow LED on the key should be lit. 2. Press the HDR TEMP key until RS485 BAUDRATE is shown on the top line of the display. Press the ▲ and ▼ arrow keys if necessary to set the baud rate to 9600. 3.
MODBUS COMMUNICATION MANUAL IMPORTANT Boilers #1 thru #8 are reserved for the Legacy Boilers connected to the Pulse Width Modulation (PWM) connections on the BMS. Therefore, NETW BOILER 1 is the same as Boiler #9. NETW BOILER 2 is the same as Boiler #10 and so on. The BMS is now programmed to control the Networked Boilers, as well as any Legacy Boilers connected to it.
MODBUS COMMUNICATION MANUAL SECTION 6 MODBUS SOFTWARE SETUP NOTE Section 6 provides Modbus Software Setup information for BMS II (Model 5R5-384) units only. Refer to Section 5 for Modbus Software Setup information for BMS (Model 168) units. NOTE The BMS II includes a Modbus Pass-Thru function which permits an EMS to monitor and configure the boilers on the Modbus network. However, it does not permit the EMS to directly control the boilers.
MODBUS COMMUNICATION MANUAL 6.2.1 Monitoring and Configuration Control In order for the C-More Boiler Controller to be recognized by the Modbus Master, a valid Network Comm Address must be entered in the Setup Menu as follows: NOTE A C-More Boiler Controller can be monitored or configured on the Modbus Network regardless of its mode of control. 1. Scroll through the Setup Menu until Comm Address is displayed. 2. With Comm Address displayed, press the CHANGE key. 3.
MODBUS COMMUNICATION MANUAL MENU OPTION SETTING Boiler Mode Remote Setpoint Remote Signal Network 3. The C-More Controller is now set for Remote Setpoint operation via the Modbus Network. 4. AERCO recommends that the Setpoint Limiting feature in the Configuration Menu be enabled. Also, ensure that the Failsafe Mode setting is set to the desired setting (Shutdown or Constant Setpoint) in the event that the Modbus Network signal is lost.
MODBUS COMMUNICATION MANUAL 5. While still in the RS232 MENU, scroll to the RS232 BAUDRATE option. Using the CHANGE key and ▲ or ▼ arrow keys, select the appropriate baud rate being used on the Modbus Network. Press the ENTER key to store the selected baud rate. 6. Next, scroll to the MODBUS ADDRESS option. Using the CHANGE key, and the ▲ or▼ arrow keys, select the desired address for the BMS II on the Modbus Network. 7. When the address is selected, press the ENTER key to store the address in memory.
MODBUS COMMUNICATION MANUAL 14. Press the ENTER key to store the setting. 15. This completes all required menu entries for this mode. The BMS II is now programmed for Remote Setpoint Operation from an EMS Master. In the event of a Modbus signal interruption, AERCO recommends that the FAIL SAFE MODE setting in the (CONFIGURATION MENU) be set to CONSTANT SETPT if you want the BMS II to continue running the Boilers in the CONSTANT SETPT Mode.
MODBUS COMMUNICATION MANUAL NOTE The remaining steps in this setup procedure involve assigning separate and distinct addresses for each Boiler on the Modbus Network. The valid address range is from 001 through 127. 16. While still in the RS485 MENU, scroll to NETW BOILER 01. The second line of the display will show ADDRESS = 001 which is the default address for Network Boiler 1. If desired, this address can be changed to any other value within the valid range (001 to 127). 17.
MODBUS COMMUNICATION MANUAL APPENDIX A C-MORE BOILER CONTROLLER STATUS & FAULT MESSAGES AND CONVERSION EQUATIONS A-1
MODBUS COMMUNICATION MANUAL Table A-1. Status and Fault Messages Code MESSAGE DESCRIPTION 1 DISABLED HH:MM pm MM/DD/YY 2 STANDBY 3 DEMAND DELAY XX sec 4 PURGING XX sec 5 IGNITION TRIAL XX sec Displayed during ignition trial of startup sequence. The duration of cycle counts up in seconds. 6 FLAME PROVEN Displayed after flame has been detected for a period of 2 seconds. Initially, the flame strength is shown in %.
MODBUS COMMUNICATION MANUAL Table A-1. Status and Fault Messages –Cont. Code MESSAGE DESCRIPTION 17 IGN SWTCH OPEN DURING IGNITION The Ignition Position Limit switch on the Air/Fuel valve opened during ignition. 18 AIRFLOW FAULT DURING IGN The Blower Proof Switch opened during ignition. 19 AIRFLOW FAULT DURING RUN The Blower Proof Switch opened during run. 20 SSOV FAULT DURING IGN The SSOV switch closed or failed to open during ignition.
MODBUS COMMUNICATION MANUAL Table A-1. Status and Fault Messages –Cont. Code MESSAGE DESCRIPTION 39 DIRECT DRIVE SIGNAL FAULT 40 REMOTE SETPT SIGNAL FAULT The remote setpoint signal is not present or is out of range. 41 OUTDOOR TEMP SENSOR FAULT The temperature measured by the Outdoor Air Sensor is out of range. 42 OUTLET TEMP SENSOR FAULT The temperature measured by the Outlet Sensor is out of range. 43 FFWD TEMP SENSOR FAULT The temperature measured by the FFWD Sensor is out of range.
MODBUS COMMUNICATION MANUAL Table A-2.
