Westinghouse Remote I/O Module 1C31181G01 Control System

Description

1C31181G01 Each Personality module has a simplifified wiring diagram label on its side, which

appears above the terminal block. This diagram indicates how the wiring from the

fifield is to be connected to the terminal block in the base unit. The 1C31181G01 diagram for the

contact input Personality module (also known as digital input) is illustrated in

Figure 8-1. The following table lists and defifines the abbreviations used in this

diagram.

1+ through 16+ Contact input positive terminal connection

1- through 16- Contact input negative terminal connection

Earth ground terminals

PS+, PS- Auxiliary Power Supply terminals

RSV Reserved terminal. No connection allowed on these terminals

The following defifinitions apply to the 1C31181G01 restrictions listed below:

— Rshunt = contact shunt resistance

— Rcontact = resistance associated with a closed contact

— Rreturn = resistance of the common return line

— Rline = resistance of the non-common cable length to and from the contact

— Rwiring = Rcontact + Rline + 16Rreturn

— Rfault = resistance from either line to ground which causes a ground fault

Figure 8-3 shows possible cable resistances that affect contact input performance.

The following restrictions apply:

• Under no-ground-fault conditions or if the channel return (low) line has a

ground fault:

— Rshunt across contact must be ≥ 10k ohms to 1C31181G01 always recognize an open

contact as open.

— Rshunt across contact must be ≥ 50k ohms to maintain the high level contact

wetting voltage.

• If the input connection from a channel has a ground fault with the contact open:

— Rshunt across contact must be ≥ 150k ohms to guarantee ground fault is

detected.

• For a ground fault on the input or return connection to a channel:

— Rfault from either line to ground 1C31181G01 must be ≤ 5K ohms to guarantee detection

of the ground fault.

• With or without ground fault conditions:

— Rwiring through fifield wiring to contact must by < 100 ohms to always

recognize a closed contact as closed.

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