Ovation Westinghouse 1C31179G02 Output Module Brand New

Description

The 1C31179G02 register at address 12 (C in Hex) is for diagnostics and is a read-only register.

The overcurrent and undercurrent status bits may be read from this register. Table

7-5 shows the overcurrent and undercurrent bits for each channel. The overcurrent

bits are used for both the voltage groups and current groups. The undercurrent bits

only have meaning for the current group. The 1C31179G02 voltage output groups do not

implement the undercurrent bit.

The simultaneous setting of a channel’s overcurrent and undercurrent bits indicates

a loss of Field Card power supply for that channel. Overcurrent and undercurrent

bits indicate the output current status of this module and not the loop current.

The Contact Input Module, 1C31179G02 comprised of an Electronics module and Personality

module, 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 8-2.

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

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

which turns on the associated opto-isolator; thereby,1C31179G02 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 of wiring fifield devices to the Contact Input Module

termination block, as shown in Figure 8-2. Each fifield contact may have a separate

input and return line as shown for channel 1. Alternatively, fifield contacts wired to

the same Contact Input Module may share a return line 1C31179G02 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.

Debouncing of a contact input signal is done by an RC fifilter and digital debouncer

on the logic side. If a contact changes state for less than 3 msec, the change of state

will always be rejected. If the Contact changes state for more than 7 msec, the

change of state will always be accepted.

Ground fault detection circuitry on a Contact Input Module activates when an input

or return line for any channel fifinds a low impedance (<5 K ohms) path to earth

ground. A single ground fault wire will not cause an error in the point data, but

multiple ground faults (if they include input and return lines) could cause faulty data

(that is, channels appearing as if contacts are closed when they are really open).

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

in the Status Register (Section 8-7) is set. If the GND Fault Attention Enable bit is

set in the Confifiguration Register (Section 8-7), a ground fault is seen as a

catastrophic error causing an attention status to be sent back to the Controller. See

Figure 8-2 for ground fault detection circuitry. The Contact Input Module is

applicable for CE Mark Certifified Systems.

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