2.5.3 R Internal relay
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How internal relay (R) works
● An internal relay only operates within a program. Its ON or OFF state is not externally output.
● Once the operation result is output and switched ON (Coil: ON), the same relay used as a
contact is also switched ON.
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Hold type relay and non-hold type relay
● Internal relays are categorized into two types, depending on how the relay operates after
powering off or switching from RUN to PROG. mode:
1. Hold type relay, which remembers the ON/OFF status immediately before the relay is
stopped and can resume operation using the same status after restarting
2. Non-hold type relay, which resets the status when the relay is stopped
● You can set the range of hold and non-hold types in Setting of the no. of local devices to
be used (in total)>Global hold-type start no. in in the "Memory Configuration" dialog box
using the tool software FPWIN GR7.
● 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.
● Hold type and non-hold type settings can be set for each global device and local device.
Non-hold type
Hold type
"Memory configuration" >
"Setting of the no. of local devices to be used (in total)" >
"Global holding start number"
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Usage restrictions
● When used as contacts, there are no restrictions on the number of times that can be used.
● As a rule, when you specify the relay as the output destination of operation results (using OT
and KP instructions), the specification is limited to once in a program. (Double output is
prohibited)
● You can also enable duplicate output using the setting for Duplicate output
authorization>Select operation in "CPU configuration". Additionally, use of SET or RST
instruction is not regarded as duplicate output.
2.5 Explanations about Relays
2-18 WUME-FP7CPUPGR-12
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