Special Internal Relays - Panasonic FP-E Programming Manual

Relays, Memory Areas and Constants
1.2.4

Special Internal Relays

Function of special internal relays
The special internal relays turn on or off under specific conditions. The on or off state
is not externally output and only functions within the program.
The principal special internal relays are as follows:
Operation status flags:
Operation status is indicated by on or off.
− Operation (RUN mode) in progress (R9020)
− Forced input/output in progress (R9029)
− Link station operation (R9060 to R909F)
− Turns on and off at each scan (R9012)
− Result of comparison instruction (R900A to R900C)
− High−speed counter control flag (R903A to R903D) and others
Error flags:
Turns on when an error occurs.
− Operation error (R9007, R9008)
− Shared memory access error (R9031) and others
Relays which turn on and off under special conditions:
The required conditions can be selected in the program and the relays used
accordingly.
− Always on relay (R9010)
− Clock pulse relay (R9018 to R901E) and others
For the FP2/FP2SH/FP10SH, if the Initialize/Test switch is set to the upper side (the
Initialize side) in the PROG mode, special internal relays R9000 to R910F go off. If
self−diagnostic error 44 or an error with a lower number has occurred, however, R9000
to R9008 are not cleared.
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