Chapter 6 IO Unit
Beijing HollySys Intelligent Technologies Co., Ltd. All Rights Reserved 139
LK234 Ethernet Interface Module
Communication slot on backboard
35 mm*100 mm*100 mm
±
0.5 mm
6.3.4 LK239 MODBUS Master/Slave Communication
Extension Module
6.3.4.1 Basic Features
Support the PROFIBUS-DP slave protocol
To support the MODBUS master /slave protocol
To connect the LK CPU module and the external MODBUS master /slave station
Installed in the I/O slot
Hot swapping
Figure 6-30 External View of LK239 Module
The LK239 module is the MODBUS master/slave communication extension module, supporting the
PROFIBUS-DP bus protocol and the MODBUS protocol, realizing the data communication from the
external MODBUS station to the LK CPU module.
The LK239 module on the PROFIBUS-DP side can only be used as the DP slave station and
exchanges the parameters and data with the LK CPU module, thus realizing the functions of the DP
slave station.
The LK239 module on the MODBUS side can be used as the MODBUS master station, or as the
MODBUS slave station, to obtain or send the MODBUS data, with function codes 01, 02, 03, 04, 05,
06, 15, 16 supported.
The max. input and output data lengths for the MODBUS data area of the LK239 module are up to 244
bytes separately. As the MODBUS master station, the max. number of the supported slave stations
must meet two restrictions of up to 244 bytes in total input (output) data length and up to 28 slave
stations at the same time.
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