232
5.2.3 Internal relay (M)
The internal relay (M) is a device for auxiliary relays used in the CPU module. All of the internal relay are set to off
when:
• the CPU module is powered off and then on,
• the CPU module is reset, or
• the latch clear is executed. ( Page 83, Section 3.4)
The internal relay cannot be latched (data retention during power failure). Use the latch relay (L) when latch is required.
(
Page 232, Section 5.2.4)
5.2.4 Latch relay (L)
The latch relay (L) is a device for auxiliary relays that can be latched inside the CPU module. During power failure, on/
off information are retained by the battery in the CPU module. The previous on/off information are retained even after
performing the following to the CPU module.
• Power OFF→ON
• Reset
The latch relay is turned off by the latch clear operation.
Scan time is prolonged when the latch relay is used. ( Page 286, Appendix 1.2)
5.2.5 Link relay (B)
The link relay is an internal relay whose point is input in hexadecimal.
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