INSTRUCTION MANUAL MICRO-DCI MicroLink PN24470 Rev.
MicroMod Automation, Inc. The Company MicroMod Automation is dedicated to improving customer efficiency by providing the most ost-effective, application-specific process solutions available. We are a highly responsive, application-focused company with years of expertise in control systems design and implementation. We are committed to teamwork, high quality manufacturing, advanced technology and unrivaled service and support.
Contents Table of Contents 1.0 INTRODUCTION 1 2.0 MICROLINK OVERVIEW 3 3.0 MICROLINK NETWORK SIZING 7 3.1 NETWORK DISTANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.2 ASSESSING THE COMMUNICATIONS LOAD . . . . . . . . . . . . . . . . . . . . 8 3.2.1 PROCEDURE TO ASSESS COMMUNICATIONS LOAD . . . . . . . . . . . . 8 3.2.2 EXAMPLE OF NETWORK COMMUNICATIONS LOAD CALCULATION . . . . . 10 4.0 MICROLINK INSTALLATION 11 4.
Contents 8.0 CONFIGURING THE 53MC5000 PCS AS A GATEWAY 23 8.1 53MC5000 PCS GATEWAY OVERVIEW . . . . . . . . . . . . . . . . . . . . . . 23 8.2 CONFIGURING THE 53MC5000 PCS GATEWAY PARAMETERS 8.2.1 PERFORMANCE TUNING . . . . . . . . . . . 24 . . . . . . . . . . . . . . . . . . . . . . . 25 8.3 ACCESSING DATALINK INSTRUMENTS FROM MICROLINK NODES . . . . . . . . 25 8.3.1 SETTING MICROLINK SUPERVISOR-PC UNIT PARAMETERS . . . . . . . . 25 8.3.1.1 MICROLINK SUPERVISOR-PC UNIT PARAMETER REFERENCE TABLE . .
Section 1. Introduction 1.0 INTRODUCTION The MICRO-DCI family of microprocessor-based control instruments supports the Datalink and MicroLink communications architectures. Datalink is an interrogator/responder serial interface and MicroLink is a Carrier Sense Multiple Access (CSMA) network permitting direct communication between any two nodes (peer-to-peer). Both networks use an RS485 physical interface.
Section 2. MicroLink Overview 2.0 MICROLINK OVERVIEW MicroLink is a low-cost, high performance interfacing network for 53MC5000 Process Control Stations (PCS), 53SU5000 SUPERVISOR-PC units, and PC units with the 53WS5000 product package installed. A Single MicroLink network supports 32 nodes of which four can be assigned to 53SU5000 SUPERVISOR-PC units. Each 53SU5000 SUPERVISOR-PC unit must have a MicroLink SUPERVISOR board and software installed to function on the network.
Section 2. MicroLink Overview The MicroLink COMMAND-RESPONSE sequence is called a transaction and network through-put is gauged as Transactions per Second (TPS) which is a function of the data transfer rate measured in bits per second. The maximum MicroLink network data transfer rate is 2 Megabits/second (2 Mbit/s); however, MicroLink networks with SUPERVISOR-PC units or PC units with the 53WS5000 product package installed, are restricted to 1 Mbit/s or less.
Section 2. MicroLink Overview Table 2-1. Attributes of Typical MicroLink Networks MicroLink Network Max. No. of Nodes Network A B SUPV Boards Redundant Cards Comm Cards in PCS* Single 32 Y N 1 0 1 Single Redundant 32 Y Y 1 1 2 Double 64 Y N 2 0 1 Double Redundant 64 Y Y 2 2 2 *Number of Communication Option Cards in each 53MC5000 PCS in the MicroLink network. Figure 2-1.
Section 3. MicroLink Network Sizing 3.0 MICROLINK NETWORK SIZING The network’s cable length requirements as well as the communications data load must be estimated for efficient network resource allocation. 3.1 NETWORK DISTANCE The maximum physical length of a MicroLink network depends on two factors: the data transfer rate and the quality of the interconnecting cable. Typically it is desirable to operate the MicroLink network at the highest achievable data transfer rate.
Section 3. MicroLink Network Sizing 3.2 ASSESSING THE COMMUNICATIONS LOAD Data through-put of the MicroLink network depends primarily on the communications data transfer rate. Column 3 in Table 3-1 shows the number of Transactions per Second that the network can support for each of the four available data rates. The number of Transactions per Second required for a specific application can be calculated by determining the number of transactions required at each node.
Section 3. MicroLink Network Sizing 4. Access the Process Control Station External Input Module (IB 53MC5000, Section 4) and sum the reciprocals of the PSCAN values for each peer-to-peer task with PMOD ≠ 0 to determine the TPS for that node. (Each configured task in the External Input Module is 1 load; therefore, if TPS = loads/scan time, then TPS = 1/scan time.
Section 3. MicroLink Network Sizing 3.2.2 EXAMPLE OF NETWORK COMMUNICATIONS LOAD CALCULATION Assumptions: Network Data Rate is set at 1 Mbit/s as dictated by configuration settings, network size, and cable type; 2 SUPERVISOR-PC units on the network; 1 PC unit with the 53WS5000 product package installed on the network; and 14 PCS modules on the network. 1. Calculate loads and TPS for the SUPERVISOR-PC units: SUPV 1LD SUPV2LD TOTAL 1a. CON B02 ≠ 255, L00 = 1, 1b.
Section 4. MicroLink Installation 4.0 MICROLINK INSTALLATION The three major steps of a MicroLink installation are ensuring that all equipment hardware is properly configured, connecting the cables to the network nodes, and defining the operating characteristics of each node with parameter entries. 4.1 NETWORK HARDWARE FOR THE PROCESS CONTROL STATION, SUPERVISOR-PC UNIT, AND PC UNIT WITH THE 53WS5000 PRODUCT PACKAGE INSTALLED 4.1.
Section 4. MicroLink Installation 4.1.2 SUPERVISOR-PC UNIT The 53SU5000 SUPERVISOR-PC unit can be ordered with MicroLink communications capabilities, or an existing unit that is an IBM AT-compatible PC (see IB 53SU5000, Section 2, for specified vendor model numbers and minimum configuration) can be field upgraded with installation of a MicroLink SUPERVISOR board (p/n 686B619) and software. Standard Datalink SUPERVISOR boards (p/n 686B574) can not be upgraded to MicroLink network functionality.
Section 4. MicroLink Installation 4.3 NODE PARAMETER ENTRIES 4.3.1 SUPERVISOR-PC UNIT PARAMETER ENTRIES Refer to IB 53SU5000 for SUPERVISOR-PC unit database information (Section 4) and configuration procedures (Section 5). To set up a SUPERVISOR-PC unit for MicroLink operation: 1. Load the MicroLink SUPERVISOR-PC unit’s unique address (0 - 31) into database location SUP00.
Section 4. MicroLink Installation A00 A24 - A23 - A431 A432 - A611 A612 - A635 SUP00.A00 - SUP00.A23 SDT00.A00 - SDT23.A16 CON00.A00 - CON89.A01 PAR00.A00 - PAR23.A00 ❊ The mapping shown above applies to a Revision 4.1 or higher SUPERVISOR board. The mapping in a Revision 4 SUPERVISOR board is: L100 - L355 L356 - L611 PLC00.L00 - PLC00.L255 PLC01.L00 - PLC01.L255 For example, the F-TRAN statement (assumes INS01 is a SUPERVISOR-PC unit) PLC00.L00 = INS01.
Section 4. MicroLink Installation 15 Figure 4-1.
16 Section 4. MicroLink Installation Figure 4-2.
Section 5. MicroLink Network Management 5.0 MICROLINK NETWORK MANAGEMENT The MicroLink nodes include various facilities for testing and maintaining the network. 5.1 SUPERVISOR-PC UNIT The SUPERVISOR-PC unit Configuration Panel (IB 53SU5000, Section 5) has been enhanced to show the current state of each node on a MicroLink network. The instrument address of each accessible node on the MicroLink network is shown on the network grid.
Section 6. MicroLink Troubleshooting 6.0 MICROLINK TROUBLESHOOTING In the event a problem should occur, check each item listed as follows: 1. Damaged Cables: Test each cable for opens and shorts using an oscilloscope. Ground the scope to ITB TB1 pin 5 of one terminator and observe the signals at TB1 pin 3 and pin 4. Both signals should be in the range of 1 to 4 volts with respect to pin 5 and should have a peak to peak amplitude of at least one volt. 2.
Section 7. MicroLink Parts List 7.0 MICROLINK PARTS LIST Parts referenced in this Instruction Book are summarized in Table 7-1 as follows: Table 7-1. Parts List Part Number 686B599U01 686B619U01 686B622U01 686B626U01 161K228U17 161K228U24 677B943U01 677B943U02 677B943U03 677B943U04 677B943U05 677B943U06 677B943U07 677B943U08 Description PCS Communications Option Card MicroLink SUPERVISOR Board Communications ITB Redundant MicroLink SUPERVISOR Board Resistor, 470 Ohm Resistor, 910 Ohm 2.5 ft (0.
Section 8. Configuring the 53MC5000 PCS as a Gateway 8.0 CONFIGURING THE 53MC5000 PCS AS A GATEWAY This section contains information to interconnect a MicroLink and Datalink network via a 53MC5000 PCS configured as a gateway. It includes gateway overview information, and 53MC5000 PCS parameter entries for gateway functionality.
Section 8. Configuring the 53MC5000 PCS as a Gateway 8.2 CONFIGURING THE 53MC5000 PCS GATEWAY PARAMETERS To activate gateway operation in a 53MC5000 PCS, set the specified datapoint parameters (see IB 53MC5000, Section 3) as follows: 1. Set INSTRUMENT ADDRESS (IA) (B01) to a unique value for the combined Datalink/Microlink network. 2.
Section 8. Configuring the 53MC5000 PCS as a Gateway 8.2.1 PERFORMANCE TUNING Three additional parameters are used to tune the operation of the gateway. 1. Set DATALINK DELAY INDEX (B289). Normally the default value of 0 is sufficient. This value represents time in 10 ms increments and is only effective when the gateway operates in Datalink interrogator mode (L260 = 1).
Section 8. Configuring the 53MC5000 PCS as a Gateway Values for the Time Delays (B04-B07) and the Time Between Transactions (B08) are dependent upon the Datalink baud rate. For baud rates of 28.8 or 9.6 Kbaud, reference sub-section 8.3.1.1; for all other baud rates, reference sub-section 8.3.1.2. 8.3.1.1 MICROLINK SUPERVISOR-PC UNIT PARAMETER REFERENCE TABLE If the Datalink network data rate is at 28.8 or 9.
Section 8. Configuring the 53MC5000 PCS as a Gateway Example calculation: The MicroLink network has 3 SUPERVISOR-PC units that will access via the gateway (Datalink interrogator) instruments 9, 10, and 11, which are on the Datalink network operating at 28.8 Kbaud. For this example, B05 and B08 must be calculated. B04, B06, and B07 are each set to 0 because their corresponding instruments will not be accessed through the gateway or a SCADA system. 28.8 Kbaud Transaction Time . . . . . . .. . . 8.
Section 8. Configuring the 53MC5000 PCS as a Gateway To reduce contention, messages from a MicroLink instrument or multiple MicroLink instruments, as applicable, should be balanced with respect to gateway through-put at the Datalink transfer rate. If the Datalink network transfer rate is at 28.8 Kbaud, the External Input Module entries of each node on the MicroLink network should limit accesses to gateway Datalink instruments to at least 3 entries apart (e.g., Tasks 0, 4, 8, etc.
Section 8. Configuring the 53MC5000 PCS as a Gateway Figure 8-1. Gateway As Datalink Interrogator Figure 8-2.
30 Section 8. Configuring the 53MC5000 PCS as a Gateway Figure 8-3.
Section 8. Configuring the 53MC5000 PCS as a Gateway 31 Figure 8-4.
32 Section 8. Configuring the 53MC5000 PCS as a Gateway Figure 8-5.
Section 8. Configuring the 53MC5000 PCS as a Gateway 33 Figure 8-6.
The Company’s policy is one of continuous product improvement and the right is reserved to modify the information contained herein without notice, or to make engineering refinements that may not be reflected in this bulletin. Micromod Automation assumes no responsibility for errors that may appear in this manual. © 2004 MicroMod Automation, Inc. Printed in USA MicroMod Automation, Inc. 75 Town Centre Drive Rochester, NY USA 14623 Tel. 585-321-9200 Fax 585-321-9291 www.micromodautomation.
