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Siemens Building Technologies Basic Documentation LMV5... CC1P7550en
HVAC Products 7 Display and operating unit AZL5... 13.08.2004
7.2.2 Connection to superposed systems
(Refer to «Port for BACS»)
Communication with a BACS is accomplished via a data link and an external bus inter-
face with galvanic separation. That interface is to be connected to the COM2 port of the
AZL5… . The interface can be used for eBus or Modbus, depending on the configuration
of the AZL5...
Modbus
With this bus protocol, the AZL5... operates as a slave. The transmission mode used is
RTU (Remote Terminal Unit). For detailed information, refer to the document “Modbus
AZL5...“.
Standardized interfacing software is available on request.
Example
: Interconnection of Siemens Simatic S7 and LMV5... system
Use in industrial applications
Management level
Automation level
Sub station
Process control
Field level
Burner management system
Burner control, boiler control
DP/MODBus converter
CAN bus
LMV5... system
7550p20e/1003
eBus
The following functions can be provided:
• Reading parameters and operating states
• Hours run
• Reading of start counter
• Fuel consumption (LMV51.2..., LMV52...)
• Operating display
• Current type of fuel
• Phase number
• Input states (if available)
• Output states including alarms (if available)
• Actual value of temperature or pressure
• Temperature or pressure setpoint
• Current output
• Final temperature or pressure setpoint
• Contents of lockout and error storages
• Identification (device identification, eBus software version)
• Existence inquiry
• Querying supported commands
• Fault status message
General information
and BACS functions
Reading eBus-specific
data
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