Delta DVP-PLC User Manual

7 Application Instructions API 50-99
DVP-PLC APPLICATION MANUAL
7-39
API Mnemonic Operands Function
60 IST
Initial State
Controllers
ES/EX/SS SA/SX/SC EH/SV
Bit Devices Word Devices Program Steps Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S * * *
D
1
*
D
2
*
IST: 7 steps
PULSE 16-bit 32-bit
ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV ES EX SS SA SX SC EH SV
Operands:
S: Start device in the designated operation mode D
1
: The smallest No. of designated step in auto mode
D
2
: The biggest No. of designated step in auto mode
Explanations:
1. S will occupy 8 consecutive points.
2. Range of D
1
and D
2
: for SA/SX/SC/EH/EH2/SV S20 ~ S899; for ES/EX/SS S20 ~ S127; D
2
> D
1
.
3. See the specifications of each model for their range of use.
4. ES/SA series MPU does not support E, F index register modification.
5. IST instruction can only be used once in the program.
6. Flags: M1040 ~ M1047. See remarks for more details.
7. IST instruction is a handy instruction specifically for the initial status of step ladder control procedure to
accommodate special auxiliary relay.
Program Example 1:
1. Use of IST instruction
M1000
IST X10 S20 S60
S
X10: Individual operation
X11: Zero return
X12: Step operation
X13: One cycle operation
X14: Continuous operation
X15: Zero return enabled switch
X16: Start switch
X17: Stop switch
2. When IST instruction is being executed, the following special auxiliary relays will switch automatically.
M1040: Operation forbidden
M1041: Operation starts
M1042: Pulse output enabled
M1047: STL monitor enabled
S0: Initiates manual operation
S1: Initiates zero return
S2: Initiates auto operation
3. S10 ~ S19 are for zero return and cannot be used as general steps. When S0 ~ S9 are in use, S0 ~ S2 represent
manual operation mode, zero return mode and auto operation mode. Therefore, in the program , you have to
write the circuit of the three steps in advance.
4. When switched to S1 (zero return) mode, any On in S10 ~ S19 will result in no zero return.
5. When switched to S2 (auto operation) mode, any On of the S in D
1
~ D
2
or M1043 = On will result in no auto
operation.

Delta DVP-PLC Specifications

General

Manufacturer	Delta Electronics
Model	DVP-PLC
Category	Controller
Humidity	5% to 95% RH, non-condensing
Programming Language	Ladder Diagram (LD), Instruction List (IL), Sequential Function Chart (SFC)
CPU Type	Various, depending on the specific model within the DVP series (e.g., ES2, EX2, SX2, SA2, EH3, etc.)
Operating Temperature	Typically 0°C to 55°C (32°F to 131°F)
Storage Temperature	Typically -25°C to 70°C (-13°F to 158°F)