Greatly Simplifies Designing, Installation, Wiring and Testing of Interposing Relays.

In general, a DCS or PLC, handles numerous discrete I/Os. One common I/O module (board) is used to supply 8, 16 or more points. Discrete output circuits from a DCS typically use low power level signals (transistors, micro relays) which cannot be sent directly to the field devices such as electromagnetic valves or motor control circuits. That is why interposing relays are often necessary.

These relays play an important role by amplifying the current capacity of the contact signal of the I/O module allowing larger current flow. In addition, discrete input circuits normally can handle only dry contacts or wet contacts of low voltage, which also require interposing relays.

Traditionally, these interposing relay circuits, regarded only as unimportant auxiliary functions, have been custom-designed and installed to suit each system. This typically requires hand wiring and powering of each relay. Since this involves point to point wiring, additional engineering man-hours are required to produce wiring drawings. Then, during a test run (debugging) of the control system, simulated I/Os with lamps and jumpers have to be temporarily connected to the relay circuits. All of this results in additional cost for the system integrator.

The 38-Rack series is a complete package for interposing relays. It greatly simplifies their designing, installation, wiring, and testing.

Typical 38 Rack I/O relay racks features:

• All-in-one rack
• Plug-to-plug connection between DCS and 38-Rack with a standard cable
• I/O simulation functions

We Design Your Interposing Relay Package.

Basic Type, 38B Series	Large Current Type, 38D Series	Loop-back Type, 38N Series

PDF 315k