User Manual

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Building Technologies M-bus System CE1P5361en
HVAC Products 5 Engineering 08.02.2007
5 Engineering
5.1 Introduction
This chapter covers fundamentals of engineering.
Following is required for the M-bus system, depending on the application:
 PC (refer to subsection 2.1.9 "Equipment combinations")
 PC software (plant operating software ACS7…, recommended is ACS741 or
ACS785, depending on the application, refer to subsection 2.2.2 "Use")
 2 modems or standard null modem cable (refer to section 6.1 "Communication
between ACS7… and OZW…")
 M-bus central units OZW… (refer to sections 2.2 "M-bus central unit OZW10" and
2.3 "M-bus central unit OZW111")
 M-bus repeater WZC-R250 (refer to section 2.6 "M-bus repeater WZC-R250")
 M-bus signal converter WZC-P… (refer to sections 2.4 "M-bus signal converter
WZC-P250" and 2.5 "M-bus signal converter WZC-P60")
 Components for lightning protection (refer to section 8.2 "Protection against tran-
sients ")
 Cable (refer to sections 5.4 "M-bus" and 5.5 "RS-485 port")
5.2 PC software
The following general conditions apply to the ACS7… programs "ACS Operation",
"ACS Alarm", "ACS Batchjob" and "ACS Service":
 In terms of programs, the number of plants is not limited. The number of supported
communication centers is only limited by the size of the PC’s hard disk
 With ACS7… V3.0 or higher, the maximum number of COM ports is unlimited. With
the former versions, the maximum number of COM ports is 4
 For every direct connection to a communication center, a COM port and a standard
null modem cable are required (refer to section 6.1 "Communication between
ACS7… and OZW…")
 Several communication centers can be connected via COM port using a modem.
For the COM port and each communication center, one modem is required
 2 different programs can be connected simultaneously to 2 different plants via dif-
ferent COM ports. Within one and the same program, it is not possible to have a
simultaneous connection to several plants
 ACS Operation and ACS Batchjob can be connected simultaneously to the same
plant
5.3 Calculation of the required number of M-bus
central units
5.3.1 M-bus central unit OZW10
Internally, the OZW10 stores all device data required for the local display and the
memory card. Data storage is dynamic. This means that each M-bus device only uses
the amount of storage space it needs. With certain types of M-bus devices (e.g.
SONOGYR
®
energy, MEGATRON
®
2), the amount of data to be transmitted can be
parameterized. With the Siemeca™ AMR devices, the amount of data is determined by
the WTX16 or WTT16 radio node on the M-bus.
Using the ACS7…, the device data can be accessed via the internal storage of the
OZW10 or directly via the devices on the M-bus. Direct access to the devices is ac-
General