
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
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
Device Specifications
Processor Modules > AC500-eCo
2019/04/17
3ADR010121, 13, en_US
25