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Honeywell 8C-TDIL11 51306858-175 Digital Input Module

The Honeywell 8C-TDIL11 51306858-175, also cataloged as the 8C-TDIL11 Digital Input Module, provides direct electrical acquisition of discrete field signals within Honeywell control system I/O networks. The module processes 32 digital input channels with optical isolation and defined ON/OFF sensing thresholds.

Hardware Specifications

Parameter	Specification
Model	8C-TDIL11 51306858-175
Brand	Honeywell
Product Type	Digital Input Module
Origin	USA
Weight	0.46 kg
Dimensions	29.5 x 12 x 7 cm estimated shipping size
Input Channels	32 channels
Input Type	Digital input
Galvanic Isolation	1500 VAC RMS or +/-1500 VDC
Isolation Technique	Optical isolation in IOM
DI Power Voltage Range	18 to 30 VDC
ON Sense Voltage	13 VDC minimum
ON Sense Current	3 mA minimum
OFF Sense Voltage	5 VDC maximum
OFF Sense Current	1.2 mA maximum
Input Impedance	4.2 K ohm
Absolute Delay Across Input Filter and Isolation	5 ms +/- 20%
Tariff Code	8537101190

Process Control Signal Isolation and DCS Input Characteristics

Honeywell 8C-TDIL11 51306858-175 applies optical isolation inside the I/O module to separate field input circuits from internal electronics. Therefore, the module maintains signal separation with a galvanic isolation rating of 1500 VAC RMS or +/-1500 VDC.

The module accepts discrete field voltage signals through 32 independent input channels. In addition, the defined sensing thresholds allow the controller to distinguish ON and OFF states according to specified voltage and current levels.

For Honeywell process control installations, digital input modules operate alongside DCS I/O architectures that may include channel-to-channel isolation requirements and field signal conditioning practices. However, this model specification only confirms optical isolation and digital signal acquisition functions.

Frequently Asked Questions

Q: What input signal range does the Honeywell 8C-TDIL11 51306858-175 accept?
A: The module accepts DI power input voltage from 18 to 30 VDC. It recognizes ON status at a minimum of 13 VDC or 3 mA and OFF status at a maximum of 5 VDC or 1.2 mA.

Q: How does the module isolate field signals from internal circuits?
A: The module uses optical isolation inside the I/O module and provides galvanic isolation rated at 1500 VAC RMS or +/-1500 VDC.

Q: What is the input processing delay of this digital input module?
A: The absolute delay across the input filter and isolation circuit is 5 ms with a tolerance of +/- 20%.

Field Installation Guidelines

Install the 8C-TDIL11 51306858-175 according to the applicable Honeywell I/O rack and system installation documentation.

• Verify that field wiring voltage levels match the specified 18 to 30 VDC DI power range before connection.
• Separate digital input wiring from high-current power cables to reduce electrical interference.
• Use proper terminal identification to prevent incorrect field signal termination.
• Maintain shield grounding practices according to the cabinet and control system design requirements.
• Confirm isolation requirements before connecting external devices to the input channels.
• Inspect wiring polarity and continuity before applying system power.

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