ABB 70BT01c HESG447024R1 Thermocouple output module

Cam and contact block selection is better understood if you: 

■ Work with each incoming and outgoing wire/circuit separately. 

■ Recognize the terms NO and NC only identify the type of contact by its mode before mounting to the operator. The “X-O” table (Page 47- 134) shows how that contact will act after assembly to the operator with the selected cam shape. X = closed circuit, O = open circuit. 

■ Up to six NO or NC contacts may be mounted behind each plunger location for a total of twelve contacts. Single circuit contact blocks have only one plunger with the other side of the block “open.” Therefore, single circuit contact blocks transmit motion to blocks behind them only for the position containing the circuit.

Systematic Approach 

Application: HAND-OFF-AUTO Selector Switch. In this circuit, one incoming line is distributed to two other outgoing circuits by the switch. The two circuits can be looked at individually.

■ Each cam has two separate lobes, each of which operates one of the two contact block plungers independently of each other. Those are identified as position A (locating nib side) and position B (opposite of locating nib). The position designations give direction in selecting and mounting of the contact blocks

“X-O” Pattern. 

From the elementary diagram, you can construct an “X-O” diagram which describes when the contacts are to be closed (X) or open (O) in the various positions of the switch.In this circuit, you want a contact closed on the left (HAND) but open in the center and right.Once the “X-O” diagram has been generated, the next step is to select the cam and contact block, or blocks, needed to perform the desired “X-O” functions. The selection table on the following page lists the various types (shapes) of cams by number to choose from and the type of contact and position to achieve the function outlined in your “X-O” diagram.

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----------------------Ruichang Mingsheng Automation Equipment Co., Ltd----------------------

PLC module, programmable controller, CPU module, IO module, DO module, AI module, DI module

Network communication module,

Ethernet module, motion control module, analog input module, analog output module, digital input module, digital output

Module, redundancy module, power module, relay output module, relay input module, processor module

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