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(2) Standard communication among master station (standard station) and local
stations (safety stations)
(a) Devices used in the program
• Link special relay (SB) and link special registers (SW)
• Devices used by the user
(b) Program example
1. Create the following program in the project for the master station (standard station) using GX
Works2.
If a response is not received for several link scans, the station is determined as a cyclic transmission faulty station, and the
status is stored in Data link status (each station) (SW00B0 to SW00B7).
2. Write the program to the CPU module on the master station (standard station), and either reset or
power it off and on.
[Online] [Write to PLC]
3. Set the CPU module on the master station (standard station) to RUN.
Device Description Device Description
SB0049 Data link status (own station) SW00B0.0 Data link status (each station) (station No. 1)
SW00B0.1 Data link status (each station) (station No. 2)
Device Description
M0 Communication condition establishment flag (station No. 1)
M1 Communication condition establishment flag (station No. 2)
N0 Nesting (station No. 1)
N1 Nesting (station No. 2)
Communication program with station No. 1
Communication program with station No. 2
Checking the data link status of
station No. 1
Checking the data link status of
station No. 2
or powering off on
RESET
RUN