DVP-ES2EX2/SS2/SA2/SX2/SE Operation Manual - Programming
5.6 IST Instruction
API Mnemonic Operands Function
Controllers
ES2/EX2
60 IST Initial State SS2 SA2 SX2
Bit Devices Word devices Program Steps Type
OP X Y M S K H KnX KnY KnMKnS T C D E F IST: 7 steps
S * * *
D *
1
D *
2
PULSE 16-bit 32-bit
ES2/EX2 SS2 SA2 SX2 ES2/EX2 SS2 SA2 SX2 ES2/EX2 SS2 SA2 SX2
Operands:
S: Source device for assigning pre-defined operation modes (8 consecutive devices). D1 The
smallest No. of step points in auto mode. D2: The greatest No. of step points in auto mode.
Explanations:
1. The IST is a handy instruction specifically for the initial state of the step ladder operation
modes.
2. The range of D1 and D2 : S20~S911, D1 < D2.
3. IST instruction can only be used one time in a program.
Program Example 1:
M1000 IST X20 S20 S60
X20: Individual operation (Manual operation) X24: Continuous operation
S:
X21: Zero return X25: Zero return start switch
X22: Step operation X26: Start switch
X23: One cycle operation X27: Stop switch
1. When IST instruction is executed, the following special auxiliary relays will be assigned
automatically.
M1040: Movement inhibited S0: Manual operation/initial state step point
M1041: Movement start S1: Zero point return/initial state step point
M1042: Status pulse S2: Auto operation/initial state step point
M1047: STL monitor enable
2. When IST instruction is used, S10~S19 are occupied for zero point return operation and
cannot be used as a general step point. In addition, when S0~S9 are in use, S0 initiates
5-22