ICS T8403 40‑Channel 24VDC TMR Digital Input Module

1. Basic Information

2. Hardware Specifications

1. Electrical & Channel Parameters

   ‑Channel count: 40 channels of 24 VDC digital input; every channel with full TMR triple‑path acquisition and hardware 2‑out‑of‑3 votingRockwell A…

   ‑Input signal: Dry contact, PNP / NPN active 24 VDC signal; operating range 18‑32 VDC; typical per‑channel input current 2 mA

   ‑Backplane power:20‑32 VDC from chassis backplane; typical power consumption 15‑18 W, max.20 W

   ‑Sampling:σ‑delta ADC triple‑channel synchronous sampling, user‑configurable threshold. Per‑channel independent line‑monitoring for open‑circuit and short‑circuit detection

   ‑SOE function:On‑board hardware SOE, 1 ms time‑stamp resolution. Timestamp generated locally upon channel status change without main‑controller CPU loading

   ‑Digital filter:Per‑channel configurable 50/60 Hz noise filter; isolation withstand 2500 V impulse opto‑galvanic barrier

2. Front‑panel & Interface

   ‑Front‑panel LEDs:Module OK, Fault, Active / Standby status indicators.

   ‑Rear‑side dual 96‑way connectors interfacing to T8803 FTA. Smart‑slot supports hot‑swap module replacement without disconnection of field wiring.

3. Environmental Conditions

   ‑Operating temperature:0℃ ~ +60℃; Storage temperature:‑25℃ ~ +70℃

   ‑Relative humidity:5‑95 % non‑condensing; IP20 cabinet installation; ATEX Zone 2 certified; industrial shock‑vibration and EMC compliance.

3. Key Functions

1. Channel‑wise TMR triple‑redundant 3‑2‑0 hardware voting:Each of 40 field signals is duplicated into three independent sampling circuits inside module, hardware 2‑out‑of‑3 voting executed. Single‑path fault is isolated automatically without disturbing corresponding channel or other channels, eliminating single‑point‑of‑failure risk.
2. Per‑channel line diagnostics:Line‑monitor resistors fitted on FTA; line‑monitor function can be enabled / disabled channel‑by‑channel via software; timestamped fault messages uploaded to system software.
3. Hardware local SOE reporting:Event timestamp generated on‑module with 1 ms accuracy for post‑incident safety analysis.
4. Hot‑swap maintenance:Module can be replaced online; field wiring on FTA side remains connected; other I/O channels keep continuous operation.
5. Universal for main / expander chassis:Installable either in T8100 main chassis or T8300 remote expander chassis; I/O points are fully transparent to main processor.
6. Comprehensive self‑diagnosis:Continuous monitoring for backplane bus, triple‑channel circuitry and FTA link; periodic built‑in self‑test for fast fault alarming and localization.

4. Typical Applications

5. Important Notes

1. Must pair with T8803 FTA, field cables cannot connect directly to module. T8803 is DIN‑rail mounted with per‑channel loop fuse protection.
2. When fitted inside T8300 expander chassis, T8310 expander‑processor must be present in same chassis.
3. Firmware build‑version must strictly match system and controller firmware; verify build‑number before spare‑part replacement.
4. Line‑monitor function requires corresponding detection resistors on FTA and software enable per‑channel. Without enable only on‑off status is read without loop‑fault diagnosis.
5. Supports dry‑contact as well as PNP/NPN active DC inputs. Not applicable for AC signals; select T8424 for AC digital‑input applications.
6. Comparison with obsolete T8402: T8402 is 60‑channel with internal‑module 1oo2D voting; T8403 adopts true channel‑level TMR 2‑out‑of‑3 voting with higher safety performance, recommended for new projects.