Emerson 5X00481G04 Controller analog input card (AI) inventory

Description

The 5X00481G04 Contact Input confifiguration (1C31233G04) provides 16 contact input current

detecting channels with common returns. The fifield side circuitry and terminal

connections for three of these channels are shown in Figure 21-4.

A +48V on-board power supply provides current limited contact wetting voltage if

the contact is open. If the contact closes, current is 5X00481G04 drawn from the +10V supply

which turns on the associated opto-isolator; thereby, relaying a closed contact state

to the I/O bus. The opto-isolators and the isolation provided by the 10V and 48 Volt

power supply provide high dielectric isolation between the fifield side and the logic

or I/O bus side.

There are two methods 5X00481G04 of wiring fifield devices to the termination block as shown in

Figure 21-4. Each fifield contact may have a separate input and return line as shown

for channel 1. Alternatively, fifield contacts wired to the same module may share a

return line as shown for channels 2 and 3. For either wiring method, do not tie the

contact return line to earth ground or a ground fault condition will occur, as well as

a degradation of the common mode surge protection.

Ground fault detection circuitry on the Sequence of Events module with Contact

Inputs activates when the input or return line for any channel fifinds a low impedance

(<5 K ohms) path to earth ground. A single wire with a ground fault will not cause

an error in the point data, but multiple ground faults, if they include input and return

lines, could cause 5X00481G04 faulty data (that is, channels appearing as if their contacts are

closed when they are really open)

When a ground fault occurs, the external error LED lights, and the GND Fault bit

11 in the Status Register is set. If the GND Fault Attention Enable bit 8 is set in the

Confifiguration Register, a ground fault is seen as a catastrophic error causing an

attention status to be sent back to the Controller. See Figure 21-4 for ground fault

detection circuitry.

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