7188XA/B/C & 7521/2/2A/3/4/7 Series Hardware User’ s Manual, Ver. 3.0 Sep/2002, 7Mh-001-20 -----
87
3.7 Using 4 COM port Application-1
COM1: PLC can access the I/O states of 7000 modules
COM2: Directly controls the 7000 input/output modules
COM3: MMICON is used as the local MMI
COM4: PC is used to monitor & record the system data.
Note: the 7188XA/7523 has 4 COM port. The 7188XB must add a X503
for 4-COM port applications.
PC
PLC
MMICON
SST-900/SST-2400
Radio Modem
7000 Series
SST-900/SST-2400
Radio Modem
7188XA or
X503 or
7523
7000 series
COM2:RS-485
COM1:RS-232
COM4:RS-232
COM3:RS-232
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