11
PKE-COM-RTU Modbus RTU communication interface for PKE12/32/65
03/20 MN034005EN
2.6.3 No slave response
In the following cases, the PKE ignores the request and does not send a response:
•
if the request contains a transmission error.
•
If the slave address in the request does not match that of the PKE.
•
with a CRC or parity error.
If the time interval between the messages is less than 3.5 characters.
The master must be programmed to repeat the request if it does not receive a
response within a specified time.
2.6.4 Modbus: Register mapping
Register mapping makes it possible to process the contents listed in the following table
in PKE via Modbus RTU.
For some controls (e.g. PLC) it is possible that these contain an offset
of +1 in the interface driver for Modbus RTU communication.
Group
Register
Input Register
30001 - 31034
Single coil
3
Output register
44001 - 44005
2.6.3 Structure of the slave response
2 Modbus RTU