Selectron DDC701T Digital Input/Output Controller Module

Product Description

Selectron DDC701T is a modular digital I/O controller unit belonging to Swiss Selectron SELECONTROL‑MAS series. It is OEM discontinued and circulated as spare part for legacy industrial automation systems. This module integrates both digital input and digital output channels for field‑side signal acquisition and discrete on‑off control within SELECONTROL‑MAS distributed control system. It adopts DIN‑rail mounting with hardware status LED indicators and communicates via back‑plane system bus, capable of networking and cooperating with CPU modules and various I/O expansion modules. Robust housing and good EMI resistance enable continuous operation inside industrial control cabinets. The T variant offers enhanced temperature tolerance and communication compatibility. It is widely used for spare‑part replacement and maintenance of legacy rail‑transit, water‑treatment and energy equipment, without direct drop‑in replacement available.

2. Product Parameters

• Model: DDC701T
• Brand: Selectron (Switzerland)
• Series: SELECONTROL‑MAS
• Product Type: Digital Input / Output Controller Unit
• I/O Type: Integrated Digital Input DI, Digital Output DO
• Power Supply: 24 VDC
• Communication: MAS back‑plane system bus
• Mounting: Standard DIN‑rail mounting
• Status Indication: LED channel status indicators
• Operating Temperature: ‑10℃ ~ +55℃
• Storage Temperature: ‑25℃ ~ +70℃
• Ingress Protection: IP20 (cabinet‑mount only)
• Product Status: OEM discontinued, industrial spare part; surplus / used units only
• Key Features: Distributed I/O acquisition & output, back‑plane bus networking, EMI resistance, quick DIN‑rail installation, LED diagnostic, compatible with SELECONTROL‑MAS architecture

3. Product Application

The Selectron DDC701T I/O controller module serves SELECONTROL‑MAS automation control systems. Main application fields are listed below:

1. Rail‑transit Control Systems: Auxiliary control for rail‑related facilities, discrete‑signal acquisition and interlock output for on‑board and wayside cabinets.
2. Water Treatment & Municipal Utilities: Distributed I/O stations in waste‑water and drinking‑water plants for pump‑valve signal acquisition and logical output control.
3. Energy & Generator Sets: Auxiliary equipment cabinets in power stations; field discrete‑signal acquisition and equipment interlock control.
4. Factory Process Automation: Control cabinets in manufacturing plants for reading limit switches, push‑buttons and relay status; driving contactors, indicator lamps and other actuators.
5. Legacy‑system Maintenance & Retrofit: Spare‑part replacement for existing SELECONTROL‑MAS installations; overhaul and faulty‑module swap to keep legacy systems operational.