150-C135NBR A-B Memory Board, Dynamic
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Place the main power disconnect switch where operators and maintenance personnel have quick and easy access to it. If you mount a disconnect switch inside the controller enclosure, place the switch operating handle on the outside of the enclosure, so that you can disconnect power without opening the enclosure. Whenever any of the emergency-stop switches are opened, power to input and output devices should be removed. When you use the master control relay to remove power from the external I/O circuits, power continues to be provided to the controller’s power supply so that diagnostic indicators on the processor can still be observed.
The master control relay is not a substitute for a disconnect to the controller. It is intended for any situation where the operator must quickly de-energize I/O devices only. When inspecting or installing terminal connections, replacing output fuses, or working on equipment within the enclosure, use the disconnect to shut off power to the rest of the system.
When using emergency-stop switches, adhere to the following points: • Do not program emergency-stop switches in the controller program. Any emergency-stop switch should turn off all machine power by turning off the master control relay. • Observe all applicable local codes concerning the placement and labeling of emergency-stop switches. • Install emergency-stop switches and the master control relay in your system. Make certain that relay contacts have a sufficient rating for your application. emergency-stop switches must be easy to reach. • In the following illustration, input and output circuits are shown with MCR protection. However, in most applications, only output circuits require MCR protection. The following illustrations show the Master Control Relay wired in a grounded system.
The structure and details of the product：
Please make an inquiry for more models
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AB 1756-LSP/B
AB 1756-M02AE
AB 1756-M02AS
AB 1756-M03SE
AB 1756-M08SE
AB 1756-M1
AB 1756-M16S
AB 1756-M16SE
AB 1756-N2
AB 1756-OA16
AB 1756-OA16I
AB 1756-OB16D
AB 1756-OB16E
AB 1756-OB16I
AB 1756-OB16I/A
AB 1756-OB16IEF
AB 1756-OB16IS
AB 1756-OB32
AB 1756-OB32/A
AB 1756-OB8
AB 1756-OF4
AB 1756-OF41794-ADN
AB 1756-OF6CI
AB 1756-OF6VI
AB 1756-OF8
AB 1756-OF8/A
AB 1756-OF81
AB 1756-OG16
AB 1756-OH8I
AB 1756-ON8
AB 1756-OV16E
AB 1756-OV32E
AB 1756-OW16I
AB 1756-OW16I/A
AB 1756-OX8I
AB 1756-PA72
AB 1756-PA72/B
AB 1756-PA72/C
AB 1756-PA75
AB 1756-PA75/A
AB 1756-PA75/B
AB 1756-PA75R
AB 1756-PAR2
AB 1756-PB72
AB 1756-PB75
AB 1756-PB75R
AB 1756-PBR2
AB 1756-PC75
AB 1756-PLS
AB 1756-PSCA2/A
AB 1756-RM
AB 1756-RM2
AB 1756-RM2/A
AB 1756SC-CTR8
AB 1756-SRM/B
AB 1756-TBCH
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