According to IEC 60204-1:2016, where control circuits are supplied from an AC
source, transformers having separate windings shall be used to separate the
power supply from the control supply.
The serial non-isolated COM1 interface provides communication via RS-485 and is carried out
as a 9-pin D-sub jack. The COM1 interface can be used
● for online connection with Automation Builder software (via a RS-485 programming cable. e.
g. TK503
Ä
Chapter 1.8.2.9 “TK503 - Programming Cable” on page 1161)
● as Modbus RTU (master and slave)
● for ASCII serial protocols
● as CS31 system bus (master only).
COM1 does not support communication via RS-232. The programming cable
TK501 cannot be used.
Table 4: Pin assignment
Serial Interface Pin Signal Description
Serial Interface 1 FE Functional earth
2 SGND 0 V power supply, internally
connected to M terminal
3 RxD/TxD-P Receive/Transmit positive
4 Reserved Reserved, not connected
5 SGND 0 V power supply, internally
connected to M terminal
6 +3.3 V 3.3 V power supply
7 Reserved Reserved, not connected
8 RxD/TxD-N Receive/Transmit negative
9 Reserved Reserved, not connected
Shield Cable shield Functional earth
NOTICE!
Risk of damaging the PLC modules!
Overvoltages and short circuits might damage the PLC modules.
– Make sure that all voltage sources (supply and process voltage) are
switched off before you begin with operations at the system.
– Never connect any voltages or signals to reserved terminals (marked with
---). Reserved terminals may carry internal voltages.
Serial interface
COM1
Serial interface
COM1
Processor Modules > AC500-eCo
2019/04/17 3ADR010121, 13, en_US 25
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