502
29 PRECAUTIONS ON PROGRAMMING
29.1 Instructions Not Available in Redundant System
29 PRECAUTIONS ON PROGRAMMING
This chapter describes the precautions on programming for a redundant system.
29.1 Instructions Not Available in Redundant System
This section describes the instructions not available in a redundant system.
Instructions that cause stop errors
Do not use the following instructions in backup mode. Doing so causes an error when the operating status of the CPU module
is changed from STOP to RUN.
Classification Instruction symbol
Special counter instructions Counting up or down the current value (1-phase input) UDCNT1
Counting up or down the current value (2-phase input) UDCNT2
Special timer instructions Teaching timer TTMR
Special function timer STMR
Shortcut control instruction Rotary table shortest direction control ROTC
Ramp signal instruction Ramp signal RAMPQ
Pulse related instructions Measuring the density of pulses SPD
Outputting pulses at regular intervals PLSY
Performing the pulse width modulation PWM
Matrix input instruction Matrix input MTR
Multiple CPU dedicated instructions Reading device data from another CPU module D.DDRD
DP.DDRD
M.DDRD
MP.DDRD
Writing device data to another CPU module D.DDWR
DP.DDWR
M.DDWR
MP.DDWR
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