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GENERAL

This GS describes the hardware specifications of the analog I/O modules that can be mounted on the safety node

unit (SNB10D) and the safety control unit (SSC10? or SSC50?).

STANDARD SPECIFICATIONS

Current Input Module

This module inputs 4 to 20 mA signals from the field.

The SAI143 can be made dual redundant.

*1: No Zener barriers can be connected to this module. An isolation barrier should be used when an intrinsic safety instrument-

ed system is used.

*2:  500 V AC when dedicated signal cable is used.

Voltage Input Module

This module inputs 1 to 5 V/1 to 10 V signals from the field.

The SAV144 can be made dual redundant.

*1:  500 V AC when dedicated signal cable is used.

Current Output Module

This module outputs 4 to 20 mA signals to the field.

The SAI533 can be made dual redundant.

GENERAL

This GS provides the hardware specifications of the digital I/O modules that can be installed in the Safety Node Unit

(SNB10D) and Safety Control Units (SSC10? and SSC50?).

STANDARD SPECIFICATIONS

Input Module

Input modules accept a contact signal from the field. SDV144 can be made dual-redundant.

If SDV144 field wiring diagnostic functions are used, the following diagnostic elements should be installed for individu-

al channels in the vicinity of the field equipment:

? SCB100 (for defective open circuit detection while accepting off signals) (*1)

? SCB110 (for defective short-circuit detection while accepting on signals) (*2)

*1:  Input signals are normally off while in normal operation.

*2:  Input signals are normally on while in normal operation.