LG GLOFA-GM Series User Manual page 260

Chapter 8 Exercising program
8.2.1 Exercising program
RS-422 channel of 1~3 stations responds to reading/writing request of monitoring device through dedicated mode
slave, thus, communication programming is not required for RS-422 channel in GLOFA-PLC. However, user
defined program shall be prepared in user mode for RS-232C channel which operates as a master station to
communicate with the module on mobile body. Because the module on mobile body operates as a dedicated
mode slave, communication programming isn't necessary. In system as in [Figure 8.4], communication between
monitoring device and module on mobile body is unavailable, thus, memory of PLC 1~3 stations shall be shared
to change data with station 4 and monitoring device. [Table 8.3] describes communication with monitoring device
and data TX/RX map between Cnet I/F modules for this.
[Table 8.3] Data TX/RX map
Area
Station
No.
Station 1
Station 2
Station 3
Station 4
[Figure 8.5] Data TX/RX path
Monitoring Device
TX/RX map with monitoring device
TX
Length
area area
%MB0 80bytes %MB100
%MB0 80bytes %MB100
%MB0 80bytes %MB100
Direct communication with monitoring device
unavailable
(data change via Cnet 1~3 stations)
80BYTES
(%MB0~%MB79)
50BYTES
(%MB100~%MB149)
TX/RX map between Cnet I/F modules
RX TX
Length
area
50bytes %MB140
50bytes %MB140
50bytes %MB140
%MB0
GM4 station 1
%MB0~%MB19 20BYTES(%MB0~%MB19)
%MB20~
Transmit data of GM4
%MB79
station
monitoring
Transmit
monitoring to GM4
%MB100~
station #4
%MB139
%MB140~149
40BYTES
%MB150~
(%MB140~%MB179)
%MB179
Fixed body
8-9
RX
Length Length
area
40bytes %MB0 20bytes
40bytes %MB0 20bytes
40bytes %MB0 20bytes
20bytes %MB100 40bytes
GM4 station 4
%MB0~%MB19
#4 to
data of
%MB100~
%MB139
Mobile body