1C311194G01 Westinghouse Ovation Valve Positioner Module

Description

1C31194G01 The Digital Input module contains 16 channels where each channel has voltage

level sensing circuitry used to detect whether an input is on or off. The module is

available with 16 isolated differential inputs, or 16 single-ended (common return)

digital inputs with on-card blown fuse detection for the auxiliary power supply. The

selection of the personality module determines if 1C31194G01 the inputs are differential or

single-ended. The input voltage level monitored by the module is determined by the

particular card group in the module.

The fifield side circuitry for the single ended confifiguration is shown in Figure 10-1

and for the differential confifiguration in Figure 10-2. An input resistor provides the

normal mode surge protection and limits the current during normal operation. An

opto-isolator provides high 1C31194G01 dielectric isolation between the fifield side and the logic

or I/O bus side.

The Single-Ended Digital Input confifiguration has a circuit used to monitor the

presence of the auxiliary supply. Two cases 1C31194G01 cause this monitor circuitry to report a

blown fuse status and issue an attention status to the Ovation Controller:

• Fuse is blown on the Personality Module.
• Auxiliary supply level is lower than minimum On Input Voltage.

The Digital Input Module is applicable for CE Mark Certifified Systems.

There are two Electronics module for the Digital Input Module:

• 1C31107G01 provides for 24/48 VAC/VDC single-ended or differential inputs.
• 1C31107G02 provides for 125 VAC/VDC single-ended or differential inputs.There are two Personality module groups1 for the Digital Input Module:
  • 1C31194G01 provides for single-ended inputs.
  • 1C31110G02 provides for differential inputs.

When the 125VAC/VDC Digital Input Emod (1C31107G02) is used in applications

without the Fused Pmod (5X00034G01), 1C31194G01 additional external fusing or other current

limiting devices are recommended on the hazardous inputs to provide additional

protection to the external wiring and power source.

If the Digital Input subsystem uses the 1C31110G01 Personality module

(confifigured for 16 single-ended inputs), the required voltage source may be

obtained from the internal auxiliary power supply (backplane) or it may be

obtained from an external power supply.

If an external voltage power supply is used, see Appendix D for the steps to be

undertaken before connecting the external power supply to the Digital Input

module base unit terminal block.

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