Rockwell Automation T8402 Trusted Dual 24V dc Digital Input Module - 60 Channel - Manual

Trusted TM
PD-T8402
Issue 13 April 10 PD-T8402 1
Trusted
TM
Dual 24 Vdc Digital Input
Module - 60 Channel
Introduction
The Trusted
TM
Dual 24V dc Digital Input module interfaces to 60 field input devices. Fault tolerance is
achieved through the ‘One-Out Of-Two D’ (1-oo-2D) voting architecture within the module for each of
the 60 input channels.
Each field input is dual and the input voltage is measured using a sigma-delta input circuit. The
resulting field voltage measurement is compared to user configurable threshold voltages to determine
the reported field input state. When a line-monitoring device is installed at the field switch, the module
can detect open and short-circuit field cables. Line monitoring functions are independently configured
for each input channel. The dual voltage measurement, coupled with on-board diagnostic testing,
provides comprehensive fault detection and tolerance.
The module provides on-board Sequence of Events (SOE) reporting with a resolution of 1ms. A
change of state triggers an SOE entry. States are determined by voltage thresholds that can be
configured on a per channel basis.
Features
• 60 dual input channels per module.
• Comprehensive, automatic diagnostics and self-test.
• Selectable line monitoring per channel to detect open circuit and short circuit field wiring
faults.
• 2500V dc optical isolation barrier.
• On-board Sequence of Events (SOE) reporting with 1ms resolution.
• Configurable 50/60Hz digital filtering to eliminate field induced noise.
• Module can be hot-replaced on-line using dedicated Companion (adjacent) Slot or SmartSlot
(one spare slot for many modules) configurations.
• Front panel module status LEDs indicate module health and operational mode (Active,
Standby, Educated).
• T 9 V Certified IEC 61508 SIL 3