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MELSEC-Q
6 PROGRAMMING
6 PROGRAMMING
When diverting the program example introduced in this chapter to the actual system,
fully check that there are no problems in the controllability of the system.
6.1 Programming Precautions
This section explains the precautions in creating programs using data on the network.
6.1.1 Interlock related signals
A list of the interlock signal devices used in the sequence programs is provided below.
Refer to Appendix 2, "List of the Link Special Relays (SB)" and Appendix 3, "List of the
Link Special Registers (SW)" for other explanations, such as the operation status and
setting status of the host and other stations.
When multiple network modules are installed, the interlock signal devices are
refreshed to the devices on the PLC side at 512 points (0
H to 1FFH) intervals according
to the default settings as listed below.
POINT
The Q series uses the link special relays (SB) and the link special registers (SW) in
the entire intelligent function module. Therefore, do not use the same SB and SW
more than once in a program.
Assignment of the link special relay (SB) and the link special register
(SW) when multiple modules are installed
Mounting
position
Device
1st module 2nd module 3rd module 4th module
SB 0H to 1FFH 200H to 3FFH 400H to 5FFH 600H to 7FFH
SW 0H to 1FFH 200H to 3FFH 400H to 5FFH 600H to 7FFH
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