Honeywell Redundant Digital Input IOTA 8U-TDILB1 32-Channel Module

Overview

The 8U-TDILB1 is a redundant 32-channel digital input module from Honeywell’s IOTA series, designed for fault-tolerant monitoring of discrete field signals within Experion PKS and TPS control systems. Its fully redundant architecture ensures high availability and continuous operation in critical control environments.

Technical Specifications

• Model: 8U-TDILB1

• Manufacturer: Honeywell

• Number of Channels: 32 digital input channels

• Input Type: Dry contact or 24 V DC sourced signals

• Input Voltage Range: 0–35 V DC (Logic high >10 V, Logic low ≤5 V)

• Input Current: ~2.5 mA per channel at 24 VDC

• Channel Isolation: 500 VDC between field wiring and system logic

• Response Time: <10 ms (configurable filtering available)

• Redundancy Switchover Time: <500 ms

• Operating Temperature: -20°C to +70°C

• Power Supply: Powered via IOPS (I/O Power Supply) unit

• Backplane Interface: IOHIGHWAY at 1.2 Mbit/s or 4 Mbit/s

• Mounting: Standard rack or DIN-compatible installation

Applications

The 8U-TDILB1 is suitable for:

• Redundant monitoring of digital signals in Experion PKS or TPS systems

• Applications requiring high-availability input modules with hot-swap capability

• Systems with critical process monitoring where channel isolation is needed

• Environments with fluctuating field signals needing rapid response

FAQ

Q: Can this module be replaced without shutting down the system?
A: Yes, the 8U-TDILB1 supports hot-swapping with automatic failover.

Q: How does the 8U-TDILB1 compare with 8U-TDILA1?
A: 8U-TDILA1 provides standard digital input functionality without redundancy, while 8U-TDILB1 adds a fully redundant architecture for fault-tolerant operation.

Q: What input types are supported?
A: It accepts both dry contact and 24 V DC sourced digital inputs.