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Honeywell 8C-PDILA1 51454471-175 Series 8 Digital Input Module

Configured for 24 VDC discrete signal acquisition in the Honeywell Series 8 I/O system, the Honeywell 8C-PDILA1 51454471-175 (8C-PDILA1 Digital Input Module) provides direct electrical monitoring of field input states through 32 isolated channels.

Hardware Specifications

Parameter	Specification
Model	8C-PDILA1 51454471-175
Brand	Honeywell
Product Type	S8 DI 24V IOM (32), Coated
Series	Honeywell Series 8 I/O
Origin	USA
Weight	0.3 kg
Dimensions	6 x 15.2 x 14.3 cm
Power Consumption	95 mA module current rating
Input Channels	32 Digital Input Channels
Input Voltage Rating	24 VDC
DI Power Voltage Range	18 to 30 VDC
ON Sense Voltage/Current	13 VDC minimum or 3 mA minimum
OFF Sense Voltage/Current	5 VDC maximum or 1.2 mA maximum
Input Impedance	4.2 KOhm
Galvanic Isolation	1000 VAC RMS or +/-1500 VDC system isolation
Isolation Technique	Optical isolation in IOM
Absolute Delay Across Input Filter and Isolation	5 ms +/- 20%
Field Resistance for Guaranteed ON Condition	300 Ohm maximum at 15 VDC
Field Resistance for Guaranteed OFF Condition	30 KOhm minimum at 30 VDC
Coating Type	Conformal coated electronics protection

DCS Signal Isolation and Process I/O Characteristics

The Honeywell 8C-PDILA1 51454471-175 integrates digital signal acquisition with optical isolation for Series 8 I/O architectures. The module monitors 24 VDC field signals and transfers discrete states through the IOTA interface.

Furthermore, the module supports channel-level electrical separation between field wiring and system electronics. The galvanic isolation design reduces interference transfer from external field circuits and supports industrial control cabinet installations.

The Honeywell Series 8 I/O platform uses integrated IOM and IOTA construction. Therefore, the module receives system power and field connections through the Input Output Termination Assembly without requiring a separate chassis.

The module also supports optional redundancy. A redundant IOM can be installed on the same IOTA to provide system-level availability without external redundancy cabling or additional control devices.

Frequently Asked Questions

Q: What type of input signals does the Honeywell 8C-PDILA1 51454471-175 accept?
A: The module accepts 24 VDC discrete input signals through 32 digital input channels. The supported DI power voltage range is 18 to 30 VDC.

Q: Does the 8C-PDILA1 provide electrical isolation between field signals and system circuits?
A: Yes. The module uses optical isolation inside the IOM and provides galvanic isolation rated at 1000 VAC RMS or +/-1500 VDC for system isolation.

Q: How is redundancy configured for this digital input module?
A: The module supports optional redundancy by installing a second IOM on the same IOTA. The configuration does not require external redundancy cables or additional redundancy control hardware.

Field Installation Guidelines

• Install the 8C-PDILA1 51454471-175 directly into the compatible Honeywell Series 8 IOTA position.
• Verify that field wiring matches the 24 VDC digital input requirements before energizing the module.
• Separate digital input wiring from high-current power cables to reduce electrical interference.
• Connect cable shields according to the control cabinet grounding practice defined for the installation site.
• Confirm correct terminal assignments at the IOTA before applying field power.
• Inspect module seating and connector engagement during installation to maintain proper backplane and termination connections.
• Use the conformal coated version in environments where moisture, dust, or chemical exposure protection is required.

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