Chapter 8 Exercising program
8-30
8.5 Communication with MASTER-K 1000H
Communication between GLOFA-PLC and MASTER-K 1000H PLC will be described below. [Figure 8.14] shows the
system where this module is connected with CPU communication port of MASTER-K 1000H via RS-232C. Programming
for Cnet I/F module as of a master station to write data in MASTERK-K1000H output area in accordance with MASTER-K
1000H’s dedicated communication protocol is described in the figure. It’s an example for Read 10-word data
from %MW100 address of GLOFA PLC and Write 10-word data to output areas of 5 cards from output card P00 of
MASTER-K 1000H.
[Figure 8.14] Communication system between GLOFA PLC and MASTER-K PLC
8.5.1 Exercising program
Cnet I/F module operates as a master station in user defined mode, and writes data to MASTER-K 1000H via CPU
port of MASTER-K 1000H PLC through dedicated protocol and WORD WRITE command among MASTER-K
dedicated communication protocols, while MASTER-K 1000H operated as a slave station processes Write data
request of GLOFA-Cnet to respond to the following result in the structure as shown in [Figure 8.14]. Prepare frame
and GMWIN program for this after setting of Cnet I/F module mode and basic setting items.
1) Setting items
As in communication via RS-232C channel of Cnet I/F module, set operation mode and basic parameters for RS-
232C channel. [Table 8.8] describes setting items of Cnet.
[Table 8.8] Setting items of Cnet I/F module
RS-232C channel setting item
Setting contents
Remark
Operation mode
Mode ‘2’ user defined mode
RS-422 channel not used
RS-232C station No.
Basic value(Not used)
Communication type
Null modem
RS-232C basic parameters
9600 BPS/DATA 8 bits
/START 1 bit/STOP 1 bit
Communication speed and basic
communication spec. shall be as
specified in spec. of MASTER-K
1000H communication.
GLOFA-PLC
MASTER-K1000H
RS-232C interface