1.2 Explanation of Relays
1-33
Specifying hold type and non−hold type relays
There are two types of link relays, which can be switched when the power is turned off
and the mode is switched from RUN to PROG and operation is stopped.
Hold type relays, which hold the on or off status in effect immediately prior to stopping,
during the period between stopping and resuming operation
Non−hold type relays, which are reset when operation stops
System register 10, 11, and 16 can be used to specify whether the link relays are the
hold or non−hold type.
Range System register no.
L0 to L63F 10
L640 to L127F 11
L1280 to L639F 16
If the beginning of a hold type relay is specified using a word number, relays before that
point will be non−hold types, and subsequent relays will be hold types.
For example, if “10” is set for system register 10, L0 to L9F will be non−hold types, and
L100 to L63F will be hold types.
For the default value, all link relays are hold types.
If used as link relays for reception, be aware that no holding operation is carried out,
even if the link relays are specified as hold types using the system registers.
Example:
Non−hold type
Hold type
Non−hold type
Hold type
System
register 10
System
register 11
L0
to
L63F
L640
to
L127F
Non−hold type
Hold type
System
register 16
L1280
to
L639F
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