Core parameters

Channel configuration: 8 digital inputs (DI) + 8 digital outputs (DO)

Signal voltage: 24VDC nominal (18–30VDC)

Input characteristics: 2.5mA per point, dry contact / wet contact compatible

Output characteristics: 24VDC/1A per channel, short-circuit protection

Bus interface: Tricon triple redundancy (TMR) system bus

Power consumption: Approximately 5W

Operating temperature: -40°C ~ +85°C

Certifications: SIL3 (IEC 61508), CE, UL, ATEX

Installation: Tricon host slot (standard 19" rack)

Weight: Approximately 1.76kg

Features and benefits

TMR triple redundancy architecture: Three-channel independent voting, no single point failure, SIL3 safety level

8DI + 8DO mixed module: One module handles both input and output simultaneously, saving slots and costs

24VDC industrial standard: Directly compatible with field sensors, solenoid valves, relays, etc.

Fault diagnosis and online maintenance: Channel-level diagnosis, short-circuit / open-circuit detection, supports hot swapping

High-reliability output: Each channel has a 1A driving capacity, with overcurrent / short-circuit protection, suitable for solenoid valves / valve actuators

Typical applications

ESD emergency stop system: Input of on-site switch signals, output of interlock valves / cut-off valves

F&G fire protection system: Input of smoke detectors, temperature detectors, combustible gas detectors, output of sound and light alarms / sprinkler

BMS boiler management system: Input of flame detection, pressure / level switches, output of fuel valves / fan control

SIL3 safety circuit: Safety control in high-risk environments such as chemical, oil and gas, and power industries

Reference of the same series

0903‑164‑7921: 8DI + 8DO mixed module (this model)

3501E: 32-channel DI module

3636R: 16-channel DO relay module