Chapter 8. Communication Functions
8-25
8.1.7 1:1, 1:N Built-in communications between LSIS products
1) Introduction
1:1 built-in communication between GM7U's is that which constitutes a built-in communication system with the method of
1(master): 1(slave). Setting Base parameter and communication parameter in GMWIN can easily constitute this system.
Communication protocol currently applied is the same with Cnet I/F used for GLOFA. Main functions are following.
• It can organize input (I), output (Q), and internal memory (M) area into 64 data access blocks by WORD unit, and set a
communication time-out limit for each block.
• Up to 32 stations can be connected. (When using built-in RS-485 (Ch. 1), G7L-CUEC)
• It can reestablish flag in relation with error codes and slave PLC operating mode according to parameter setting.
• It can reset flag related with error codes and sending/receiving error frequency of each parameter.
• It monitors communication status, using monitoring function of GMWIN.
• This communication cabling map is the same for (3) 1:1 connecting with other GM7U in 8.1.2 "System configuration method
using built-in communication."
GM7U Main unit
(Slave: Station no. 31)
GM7U Main unit
(Master: Station 1)
G7E-DR10A
1:1 dedicated protocol communication between GM7U’s (using RS-232C)
GM7U main unit
(Master: Station 0)
1:N dedicated protocol communication between GM7U’s (using RS-485C)
GM7U main unit
(Slave: Station 1)
GM7U main
(Slave: Station 31)
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