Overview
Manuals
SOE Modes
IOTA Wiring
SOE Checks
Features:
- Thirty-two coated 24 VDC digital-input channels.
- One-millisecond Sequence of Events resolution with normal and low-latency PV modes.
- Supports documented nonredundant or redundant Series 8 IOTAs.
8C-PDISA1 is the coated Series 8 digital-input Sequence of Events IOM. Honeywell specifies three operating modes: normal operation with a 20 ms PV scan, SOE operation with 1 ms event resolution and a 20 ms PV scan, and low-latency operation with a 5 ms PV scan. The module accepts 24 VDC discrete inputs across 32 channels and supports direct or reverse indication, onboard excitation power, internal or external field-power selection and optical isolation within the IOM.
The IOM must be paired with the correct coated termination assembly: 8C-TDILA1 for the nominal 9-inch nonredundant arrangement or 8C-TDILB1 for the nominal 12-inch redundant arrangement. Honeywell specifies an 18-30 VDC DI power range, 95 mA module current, 13 VDC or 3 mA minimum ON sensing, 5 VDC or 1.2 mA maximum OFF sensing, 4.2-kilohm input impedance and 5 ms +/-20% filtering-and-isolation delay. These figures apply to the documented module path and do not establish packed dimensions or shipping weight.
The 8C-PDISA1 51454471-275 Honeywell Series 8 Digital Input SOE Module may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Honeywell 8C-PDISA1 51454471-275 official technical documentation and product links.
This multi-page Honeywell technical document contains the exact model and its technical data. Apply the values to the supplied type number and verify its revision before installation.
Select normal, Sequence of Events or low-latency operation only through the approved controller configuration. Preserve channel enablement, direct or reverse indication, time synchronization, event handling and alarm logic. The 1 ms value is SOE event resolution; it is not the normal PV scan rate.
Match the installed IOTA and architecture before moving conductors. Use 8C-TDILA1 for the documented nonredundant coated arrangement or 8C-TDILB1 for the redundant coated arrangement. Preserve field-power source, polarity, commons, channel numbering, grounding and terminal assignments.
Back up the control configuration and event settings before removal. After installation, verify time synchronization, force or simulate each authorized input state, confirm ON/OFF thresholds, inspect event timestamps and alarm sequence, and prove both redundant paths where the redundant IOTA is used.
