Overview
Manuals
SOE Module Identity
Timing Modes
No Pulse Accumulation
Features:
- Honeywell identifies 8C-PDISA1 as 32-channel coated 24 VDC DI SOE.
- SOE event resolution is 1 ms while the cited SOE PV scan is 20 ms.
- First-16-channel pulse accumulation belongs to different model 8C-PDIPA1.
Honeywell's Series 8 specification section 4.4.8 names 8C-PDISA1 Digital Input Sequence of Events and specifies 32 channels. It gives three operating modes: normal, with 20 ms PV scanning; SOE, with one-millisecond time-tag resolution and 20 ms PV scanning; and low latency, with 5 ms PV scanning. The table lists 24 VDC rating, 18–30 VDC digital-input field-power range, 95 mA module current and optical isolation. The coated IOTAs are 8C-TDILA1 for a nine-inch non-redundant arrangement and 8C-TDILB1 for a twelve-inch redundant arrangement. The exact installed mode and event-time architecture should be checked before a timing claim is used in a system design.
The next section of the same Honeywell PDF describes 8C-PDIPA1, a different Series 8 Digital Input Pulse Accumulation module. It is that model whose first 16 channels may be set for pulse accumulation; the website's current PDISA1 text appears to have copied that neighboring function. The SOE module is not a substitute for a pulse-accumulation card merely because both use 24 V input and similar IOTAs. The reviewed PDF also does not map 51454471-276, so compare the full physical label and manufacturer parts record. Preserve channel assignments, field supply, IOTA, time-synchronization and baseline events before authorized replacement, then verify input states, time tags, diagnostics and redundancy where installed.
The 8C-PDISA1 51454471-276 Honeywell 24 VDC SOE Digital Input 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 51454471-276 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.
Honeywell names 8C-PDISA1 as a coated Digital Input Sequence of Events module with 32 inputs. It is not the pulse-accumulation variant despite similar Series 8 designations. The OEM table does not map the site's extra 51454471-276 marking, so confirm a readable physical label and authoritative parts record. Match the actual 8C-TDILA1 or 8C-TDILB1 IOTA and installed Experion release before treating a spare as exact.
The manufacturer specifies normal 20 ms PV scanning, SOE one-millisecond time resolution with a 20 ms PV scan, and low-latency 5 ms PV scanning. These are separate operating modes, not simultaneous guarantees. SOE resolution is a time-tag property and must not be relabeled as a one-millisecond process-value scan. Check configured mode, time synchronization, event capture and application requirements before replacement and test the behavior after authorized work.
Honeywell's following page assigns first-16-channel pulse accumulation and frequency measurement to 8C-PDIPA1, not 8C-PDISA1. Both pages discuss 24 V digital input hardware, which can tempt a copied description, but their functions differ. Remove pulse-accumulation claims from this SOE page and verify the required function on the original equipment label and system database before selecting a replacement module.
