General fieldbus interface data
Modbus RTUCommunication protocol
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Line (bus) structure
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Active bus termination at both ends
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Coupling and uncoupling of devices during operation without affecting other devices is
possible
Network topology
Twisted, screened copper cable according to IEC 61158Transmission medium
EIA-485 (RS485)Fieldbus interface
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Baud rate and maximum cable length (segment length) without repeater:
byebetween 300 and 38,400 bit/s: 1,200 m
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Baud rate and possible cable length with repeater (total network cable length):
byebetween 300 and 38,400 bit/s: approx. 10 km
Transmission speed/cable
length
Modbus slave, e.g. devices with digital and/or analogue inputs/outputs such as actuators,
sensors
Device types
32 devices in each segment without repeater, with repeaters expandable to 247Number of devices
Polling between master and slaves (query response)Bus access
01 Read Coil Status
02 Read Input Status
03 Read Holding Registers
04 Read Input Registers
05 Force Single Coil
15 (0FHex) Force Multiple Coils
06 Preset Single Register
16 (10Hex) Preset Multiple Registers
07 Read Exception Status
17 (11Hex) Report Slave ID
08 Diagnostics:
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00 00 Loopback
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00 10 (0AHex) Clear Counters and Diagnostic Register
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00 11 (0BHex) Return Bus Message Count
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00 12 (0CHex) Return Bus Communication Error Count
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00 13 (0DHex) Return Bus Exception Error Count
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00 14 (0EHex) Return Slave Message Count
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00 15 (0FHex) Return Slave No Response Count
Supported fieldbus functions
68
SG 05.1 – SG 12.1/SGR 05.1 – SGR 12.1 Control unit: electromechanic
Technical data AC 01.1 Intrusive Modbus RTU