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3. Instruction Set
3-169
API Mnemonic Operands Function
66
ALT P
Alternate State
Controllers
ES2/EX2 SS2 SA2
SE
SX2
Bit Devices Word devices Program Steps Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
D * * *
ALT, ALTP: 3 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
Operands:
D: Destination device
Explanations:
144. The status of D is alternated every time when the ALT instruction is executed.
145. When ALT instruction is executed, ON/OFF state of D will be switched which is usually applied
on switching two operation modes, e.g. Start/Stop
146. This instruction is generally used in pulse execution mode (ALTP).
Program Example 1:
When X0 goes from OFF to ON, Y0 will be ON. When X0 goes from OFF to ON for the second time,
Y0 will be OFF.
X0
ALTP Y0
X0
Y0
Program Example 2:
Creating a flashing circuit by applying ALTP with a timer
When X20 = ON, T0 will generate a pulse every two seconds and output Y0 will be switched
between ON and OFF by the pulses from T0.
X20
TMR T0
ALTP Y0
K20
T0
T0