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Ajbenny

Analog trouble with 1769-L24er-QBFC1B Allen Bradley

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Hi, I,m new to this PLC. I,m trying to set up 4-20ma signal on this controller but having no luck. I,m reading a level off a unit that sends out a 4- 20ma signal and i,m terminating in straight into my PLC but it doesn,t read at all on my ladder logic. I have set up 4-20 on analog properties . I have terminated it into 0in - and Iin - .Do i have to have 24V supply on CJC+? or am i missing something, any help??

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This processor has a unique "universal" analog inputs, and as you have found, the manual many not be crystal clear on this.

The bottom line is:  for analog voltage inputs, DO NOT connect Vin+ to In+ (that is a given) on the same analog channel; for analog current inputs, DO connect (Vin+ to In+) on the same analog channel.

Refer to pg. 189

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