6 ist instruction, 4 step ladder instructions, Restrictions on divergence sequence – Delta Electronics Programmable Logic Controller DVP-PLC User Manual
Page 187: Dvp-plc application manual 4-17, Ist: 7 steps, The smallest no. of designated step in auto mode d, And d
4 Step Ladder Instructions
DVP-PLC Application Manual
4-17
Restrictions on Divergence Sequence:
1. You can use maximum 8 divergence steps in a divergence sequence. As the diagram below, there are maximum
8 diverged steps S30 ~ S37 after step S20.
2. You can use maximum 16 loops in multiple divergence sequences or in simultaneous sequences combined into
one sequence. As the diagram below, there are 4 steps diverged after S40, 7 steps diverged after S41, and 5
steps diverged after S42. There are maximum 16 loops in this sequence.
3. You can designate a step in the sequence to jump to any step in another sequence.
Y26
S60
X26
X41
S0
S20
S30
S40
S0
M1002
X0
X1
X11
X51
Y0
Y1
Y11
S50
X20
S80
Y41
S51
S71
X33
Y15
Y33
S53
S73
X35
Y17
Y35
X32
X44
S70
Y32
Y14
S31
Y2
X12
X2
S32
Y4
X15
X4
S41
Y12
X21
X52
S54
Y20
S0
SET
S32
Y3
X14
X3
S52
S72
X34
Y16
Y34
S0
SET
X13
S20
OUT
S20
OUT
S81
X45
Y42
SET
S34
Y5
X15
X5
S35
X15
X6
S55
S74
X36
X22
X46
Y27
S61
X27
X42
Y30
S62
X30
Y31
S63
X31
Y40
S76
X43
X50
Y6
S36
X16
X7
Y7
Y21
Y36
S56
Y22
S57
Y23
S20
X23
OUT
RST
S36
Y10
Y13
Y25
Y37
S58
X37
X24
Y24
RST
S58
S37
S42
S59
S75
X40
X47
X10
X17
X25
SET
S0
OUT
S42
4.6 IST Instruction
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. IST instruction can only be used once in the program.
5. Flags: M1040 ~ M1047. See remarks for more details.
6. IST instruction is a handy instruction specifically for the initial status of step ladder control procedure to
accommodate special auxiliary relay.