Allen-Bradley 1785-L20B

Identifies information about practices or circumstances 

that can lead to personal injury or death, property 

damage, or economic loss. Attentions help you:

• identify a hazard

• avoid a hazard

• recognize the consequence

Description:

Select I/O modules to interface your PLC-5 controller with machines or 

processes that you determine while analyzing your plant operation.

Use the following list and table as guidelines for selecting I/O modules and 

operator control interface(s). 

• How much I/O is required to control your process(es)?

• Where will you concentrate I/O points for portions of an entire process 

when the entire process is distributed over a large physical area?

• What type of I/O is required to control your process(es)? 

• What is the required voltage range for each I/O module?

• What is the backplane current required for each I/O module?

• What are the noise and distance limitations for each I/O module?

• What isolation is required for each I/O module?

The density of an I/O module is the number of controller input or output 

image-table bits to which it corresponds. A bidirectional module with 8 input 

bits and 8 output bits has a density of 8. I/O module density helps determine 

your I/O addressing scheme. See chapter 4 for more information about I/O 

addressing

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E-mail: alex@fenoux.com

Tel.: +86 13338369201

Skype: +86  13338369201

WhatsApp: +86  13338369201