operational rule for programming programmable logic controllers
TRANSCRIPT
Operational Rule for Programming
Programmable Logic Controllers
Your comfort level with your responses to the following 3 question assessment tool should indicate if the presentation that follows will increase you knowledge base on the topic outlined by the questions in this tool.
Pre-presentation Self Assessment Activity
1. Wire a N.O. active low TSL and a N.C. active low PSL to an input module of a PLC. Wire an active high motor starter circuit to the output module of the same PLC and then, using ladder (logic) language, program the PLC so that the motor will run only when both limit sensors are in alarm. Include the program, the wiring diagram, and the I/O map as documentation.
3.
Pre-presentation Self Assessment Activity
Wire a N.C. active high TSL and a N.O. active high PSL to an input module of a PLC. Wire an active high motor starter circuit to the output module of the same PLC and then, using ladder (logic) language, program the PLC so that the motor will not run when both limit sensors are in alarm. Include the program, the wiring diagram, and the I/O map as documentation.
Wire a N.C. active high TSL and a N.O. active high PSL to an input module of a PLC. Wire an active high motor starter circuit to the output module of the same PLC and then, using ladder (logic) language, program the PLC so that the motor will run when both limit sensors are in alarm. Include the program, the wiring diagram, and the I/O map as documentation.
2.
I 0,7
Module #
O 0,0
Module type
O 0,7
Terminal #
Input module # 1 terminal connector # 0
I 0,0
Module type
26-761
26-762
26-763
26-767
26-769
26-764
26-768
26-766
Output module # 0 terminal connector # 7
Output module # 0
I/O module structure
O 0,0
O 0,7
I 1,0
I 1,7
TSL
N.C.
24 V
PSL
N.0.
24 V
24 V input module
48 V output module
Motor starter 1
440 V
I/O Wiring
Input/Output Wiring
Wiring field devices to I/O module structure
O-0,0
O-0,7
I-1,0
I-0,7
N.C.
24 V
PSL
N.0.
24 V
24 V input module
48 V output module
Motor starter1
440 V
I/O Wiring
42-301
42-302
42-303
42-307
42-309
42-304
42-308
42-306
83-541
83-542
83-543
83-547
83-549
83-544
83-548
83-546
I-0,0
I-0,7
48 V input module
26-761
26-762
26-763
26-767
26-769
26-764
26-768
26-766
Task:The motor is to run when both limit sensors are in alarm.TSL Note
: Both sensors are active low
Harness Connection
Field Device
I/O Address
42-301TSL I-1,0
42-302PSL I-1,1
MS 1(Motor starter)
83-542 O-0,4
I/O Map
Documenting wiring to I/O module
O-0,0
O-0,7
I-1,0
I-0,7
N.C.
24 V
PSL
N.0.
24 V
24 V input module
Motor starter1
440 V
I/O Wiring
Harness Connection
Field Device
I/O Address
42-301
42-302
42-303
42-307
42-309
42-304
42-308
42-306
83-541
83-542
83-543
83-547
83-549
83-544
83-548
83-546
42-301TSL I-1,0
42-302PSL I-1,1
MS 1(Motor starter)
83-542 O-0,4
I-0,0
I-0,7
48 V input module
26-761
26-762
26-763
26-767
26-769
26-764
26-768
26-766
Ladder (logic) Program
I/O Map
TSL
I-1,0I-1,1 O-0,4
PSL
(b) Program executed by the PLC
Task:The motor is to run when both limit sensors are in alarm.TSL
(a) Actual PLC program written for the task
I-1,0I-1,1 O-0,4
Example of a single rung ladder program
PSLTSL
Note: Both sensors are active
low
PLC operating rules:
(b) When the rung is contiguous, the output address goes active.
(a) The PLC changes your program symbol when the input address is at logic “1”
PLC project documentation set
48 V output module
O-0,0
O-0,7
I-1,0
I-0,7
N.C.
24 V
N.O.
24 V
24 V input module
Motor starter1
440 V
I/O Wiring
Harness Connection
Field Device
I/O Address
42-301
42-302
42-303
42-307
42-309
42-304
42-308
42-306
83-541
83-542
83-543
83-547
83-549
83-544
83-548
83-546
42-301TSL I-1,0
42-302PSL I-1,1
MS 1(Motor starter)
83-542 O-0,1
I-0,0
I-0,7
48 V input module
26-761
26-762
26-763
26-767
26-769
26-764
26-768
26-766
I/O Map
TSL
Task:The motor is to run when both limit sensors are in alarm.Note
: Both sensors are now active high
TSL
I-1,0I-1,1 O-0,5
PSL
(b) Program executed by the PLC
Ladder (logic) Program (a) Actual PLC program written for the task
I-1,0I-1,1 O-0,5
Example of a single rung ladder program
PSLTSL
PLC operating rules:
(b) When the rung is contiguous, the output address goes active.
(a) The PLC changes your program symbol when the input address is at logic “1”
PLC project documentation set
48 V output module
PSL
Pre-presentation Self Assessment Activity
Ladder (logic) Program
Actual PLC program written for the task
I-1,0I-1,1 O-0,4
PSLTSL
O-0,0
O-0,7
I-1,0
I-0,7
N.C.
24 V
PSL
N.0.
24 V
24 V input module
48 V output module
Motor starter1
440 V
I/O Wiring
42-301
42-302
42-303
42-307
42-309
42-304
42-308
42-306
83-541
83-542
83-543
83-547
83-549
83-544
83-548
83-546
I-0,0
I-0,7
48 V input module
26-761
26-762
26-763
26-767
26-769
26-764
26-768
26-766
TSLHarness Connection
Field Device
I/O Address
42-301TSL I-1,0
42-302PSL I-1,1
MS 1(Motor starter)
83-542 O-0,4
I/O Map
Wire a N.O. active low TSL and a N.C. active low PSL to an input module of a PLC. Wire an active high motor starter circuit to the output module of the same PLC and then, using ladder (logic) language, program the PLC so that the motor will run only when both limit sensors are in alarm. Include the program, the wiring diagram, and the I/O map as documentation.
1.
Harness Connection
Field Device
I/O Address
42-301TSL I-1,0
42-302PSL I-1,1
MS 1(Motor starter)
83-542 O-0,4
I/O Map
O-0,0
O-0,7
I-1,0
I-0,7
N.O.
24 V
PSL
N.C.
24 V
24 V input module
48 V output module
Motor starter1
440 V
I/O Wiring
42-301
42-302
42-303
42-307
42-309
42-304
42-308
42-306
83-541
83-542
83-543
83-547
83-549
83-544
83-548
83-546
I-0,0
I-0,7
48 V input module
26-761
26-762
26-763
26-767
26-769
26-764
26-768
26-766
TSL
Ladder (logic) Program
Actual PLC program written for the task
I-1,0I-1,1 O-0,4
PSLTSL
2.
Pre-presentation Self Assessment ActivityWire a N.C. active high TSL and a N.O. active high PSL to an input module of a PLC. Wire an active high motor starter circuit to the output module of the same PLC and then, using ladder (logic) language, program the PLC so that the motor will run when both limit sensors are in alarm. Include the program, the wiring diagram, and the I/O map as documentation.
O-0,0
O-0,7
I-1,0
I-0,7
N.O.
24 V
PSL
N.C.
24 V
24 V input module
48 V output module
Motor starter 1
440 VI/O Wiring
42-301
42-302
42-303
42-307
42-308
42-306
83-541
83-542
83-543
83-547
83-544
83-548
83-546
I-0,0
I- 0,7
48 V input module
26-761
26-762
26-763
26-767
26-768
26-766
TSLLadder (logic) Program
Actual PLC program written for the task
I-1,0I-1,1 O-0,4
PSLTSL
O-0,0
O-0,7
I- 1,0
I- 0,7
N.C.
24 V
PSL
N.0.
24 V
24 V input module
48 V output module
Motor starter 1
440 VI/O Wiring
42-301
42-302
42-303
42-307
42-309
42-308
42-306
83-541
83-542
83-543
83-547
83-549
83-544
83-548
83-546
I- 0,0
I- 0,7
48 V input module
26-761
26-762
26-763
26-767
26-768
26-766
TSL
Take home observation
Ladder (logic) Program
Actual PLC program written for the task
I-1,0I-1,1 O-0,4
PSLTSL
Motor should run when both sensors in alarm
Motor should run when both sensors in alarm
It does not matter if there are N.O. or N.C. contacts but it does matter if the sensor is active low or active high.
Both sensors are active low
Both sensors are active high
O-0,0
O-0,7
I-1,0
I-0,7
N.O.
24 V
PSL
N.C.
24 V
24 V input module
48 V output module
Motor starter 1
440 VI/O Wiring
42-301
42-302
42-303
42-307
42-308
42-306
83-541
83-542
83-543
83-547
83-544
83-548
83-546
I-0,0
I- 0,7
48 V input module
26-761
26-762
26-763
26-767
26-768
26-766
TSL
Motor should not run when both sensors in alarm
Both sensors are active high
3.
Pre-presentation Self Assessment ActivityWire a N.C. active high TSL and a N.O. active high PSL to an input module of a PLC. Wire an active high motor starter circuit to the output module of the same PLC and then, using ladder (logic) language, program the PLC so that the motor will not run when both limit sensors are in alarm. Include the program, the wiring diagram, and the I/O map as documentation.
Actual PLC program written for the task
Ladder (logic) Program
I-1,0
O-0,4
PSL
I-1,1
TSL
O-0,0
O-0,7
I-1,0
I-0,7
N.O.
24 V
PSL
N.C.
24 V
24 V input module
48 V output module
Motor starter 1
440 VI/O Wiring
42-301
42-302
42-303
42-307
42-308
42-306
83-541
83-542
83-543
83-547
83-544
83-548
83-546
I-0,0
I- 0,7
48 V input module
26-761
26-762
26-763
26-767
26-768
26-766
TSL
Ladder (logic) Program
Actual PLC program written for the task
I-1,0I-1,1 O-0,4
PSLTSL
Take home observation
Motor should run when both sensors in alarm
In both situations both sensors are active high
O-0,0
O-0,7
I-1,0
I-0,7
N.O.
24 V
PSL
N.C.
24 V
24 V input module
48 V output module
Motor starter 1
440 VI/O Wiring
42-301
42-302
42-303
42-307
42-308
42-306
83-541
83-542
83-543
83-547
83-544
83-548
83-546
I-0,0
I- 0,7
48 V input module
26-761
26-762
26-763
26-767
26-768
26-766
TSL
Actual PLC program written for the task
Motor should not run when both sensors in alarmLadder (logic) Program
I-1,0
O-0,4
PSL
I-1,1
TSL
Motor will not run if the TSL OR the PSL is passive.
Motor will run if the TSL OR the PSL is active.
End of Presentation
