Product Core Brief

• Model: DSPC172H, OEM order code 57310001-MP, redundant pair kit DSPC172HK01
• Brand: ABB
• Series: S100 rack extended-temperature high-memory central processing unit for Advant Mod300 legacy DCS systems
• Core Function: Execute large TCL/TLL control sequences, poll expanded ModuleBus I/O loads, run dual isolated DCN inter-station communication for wide-temperature industrial environments
• Product Type: Full-size Eurocard slide-in S100 rack main CPU PCB, no separate termination unit required
• Key Specs: 4x expanded program memory vs DSPC170 | -25°C to +65°C operating range | Dual galvanically isolated DCN ports | Bumpless redundant failoverNote: Discontinued wide-temperature legacy controller, stocked inventory is New Surplus with intact factory anti-static sealed packaging.

Key Technical Specifications

• Auxiliary rack operating supply: 24VDC ±20% logic feed, total module power draw ≤5.4W
• Supported control languages: Taylor Control Language (TCL), Taylor Ladder Logic (TLL)
• Onboard non-volatile memory: 4x expanded program storage and extended alarm historical buffer matching standard DSPC172 capacity
• Backplane bus: Synchronous S100 ModuleBus, supports up to 24 mixed I/O modules per rack without scan latency degradation
• Network interface: Dual-channel galvanically isolated DCN control network for peer Mod300 station data exchange
• Redundancy capability: Two units operate as active/standby redundant pair with zero-setpoint-drift bumpless failover
• Hot-swap rating: Fully hot-swappable on energized Mod300 S100 backplane racks
• Front panel diagnostics: RUN indicator, ModuleBus fault lamp, dual DCN communication alarm LEDs, hardware reset pushbutton
• Continuous operating temperature: -25°C to +65°C full maximum program load; control loop scan timing derates above 65°C
• Storage environmental limits: -40°C to +85°C, 5%–95% RH non-condensing
• Physical dimensions: 324mm D × 22.5mm W × 234mm H; unit mass 0.95kg
• Compliance standards: CE, UL, RoHS, IEC 61000-6-2 Class A industrial EMC
• System compatibility: Advant Mod300 S100 racks; incompatible with S800, AC800M, UNITROL, S400 remote I/O platforms

Product Introduction

This wide-temperature high-memory main processor board serves as the core computing engine for Mod300 rack DCS deployments in offshore, refinery, and unconditioned cabinet environments that exceed standard 0–55°C CPU limits. It handles dense ModuleBus I/O loads without slowing PID and interlock scan cycles.Dual isolated DCN network ports enable redundant cross-station data transfer, and the extended low/high temperature rating eliminates costly cabinet HVAC upgrades for remote field control houses.

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Cross-reference serial numbers against ABB Mod300 legacy component trace databases; inspect backplane gold edge fingers for oxidation, front diagnostic LED segment integrity, PCB conformal coating for peeling; verify factory static packaging seal remains unbroken for surplus inventory.
2. Live Testing: Mount the unit to a Mod300 rack test bench paired with a full expanded mixed I/O load bank and dual DCN network simulator; upload maximum-size validated TCL/TLL control logic and run uninterrupted 24-hour continuous loop scanning and cross-station network data exchange across simulated -25°C and +65°C thermal profiles; use a Fluke 115 to log steady 24VDC auxiliary supply voltage through the full test cycle.
3. Electrical Testing: Perform 500VAC hipot insulation testing between both DCN communication ports and backplane logic ground; pass threshold set at >10MΩ insulation resistance; inject reversed DC supply voltage to confirm hardware polarity lockout activates without damaging network transceiver semiconductors.
4. Firmware/Config Backup: Record factory CPU operating firmware revision via Mod300 engineering workstation; photograph front dual DCN terminal pin layouts and document redundant CPU jumper settings for site commissioning reference.
5. Final QC & Packaging: Torque all DCN network terminal screw connections to OEM torque specifications; enclose the board in static-dissipative foam; attach a printed QC tag listing serial number and completed test metrics before carton sealing.

Installation Pitfalls & Guide (Engineer to Engineer)

❗Firmware Mismatch Risk: Mismatched firmware versions between primary and standby redundant CPUs break bumpless failover. Fault outcome: Full process control outage during CPU switchover, lost analog setpoint tracking. Mitigation: Flash identical validated firmware revisions to both controller cards before rack power-up; archive matched firmware files to plant engineering servers.❗Mixed Model Redundancy Conflict: Pairing with standard DSPC172 or DSPC170 creates thermal register and memory mismatch errors. Fault outcome: Intermittent I/O timeouts and incomplete batch sequence execution under extreme cabinet temperatures. Mitigation: Only pair identical variants for redundant rack architectures.❗Missing DCN Bus Termination Risk: Omitted termination resistors on end-of-trunk DCN ports create signal reflection noise. Fault outcome: Cyclic DCN communication timeouts, missing cross-station process alarm data. Mitigation: Fit OEM DCN terminator blocks at both physical endpoints of each DCN trunk per wiring schematics.❗Overloaded ModuleBus Backplane Risk: Populating a single rack with more than 24 I/O modules exceeds the CPU’s bus scan timing budget. Fault outcome: Slowed control loop scan rates, delayed safety interlock response times. Mitigation: Split high-density I/O loads across multiple DSBC176 extended subracks to balance ModuleBus traffic.❗ESD Dangers: Low-humidity offshore and refinery control room air generates static charge that damages delicate DCN network transceiver ICs on the PCB. Field service logs show ungrounded handling creates intermittent total rack I/O dropout faults that require 10–16 hours of diagnostic labor to isolate. Mitigation: Establish direct contact with bare cabinet chassis ground metal for three full seconds before touching backplane edge fingers or DCN network terminal connectors.

4-Step Replacement Guide

1. Pre-install: Set the Mod300 engineering workstation to manual hold mode to freeze all closed-loop PID setpoints; photograph front dual DCN trunk cable pin assignments and record redundant CPU jumper configuration if operating in standby pair mode.
2. Removal: Unplug both DCN shielded trunk cables fully from the controller’s front network ports; release the rack slot retention clips and extract the faulty board straight outward without scraping PCB components against cabinet metal framing.
3. Install: Slide the new unit evenly into the target rack slot and engage retention clips fully; replicate the photographed dual DCN trunk wiring connection, reconfigure redundant CPU jumpers to match original operating mode, then reattach both DCN trunk cables fully seated into the network ports.
4. Power-on Test: Energize 24VDC auxiliary rack supply; initiate continuous ModuleBus full I/O polling and dual DCN cross-station data exchange from the Mod300 simulator, confirm zero communication fault counters accumulate during 30 minutes of idle control loop operation before restoring live process control logic.

FAQ (Frequently Asked Questions)

Q: Can this unit directly replace standard DSPC172 hardware without TCL/TLL logic edits?A: Physical swap is mechanically compatible, but the extended temperature variant includes modified thermal monitoring registers. All existing control logic will run unmodified, but you must update workstation configuration to enable high/low ambient fault alarm thresholds in AdvaBuild.Q: Does hot-swap capability remove the requirement to set the controller to manual hold mode during replacement?A: Hot-swap only protects the module’s internal circuits from power surge damage; it does not maintain active control loop execution during the swap window. Manual hold mode remains mandatory to prevent unregulated valve stroke movement and lost process setpoint tracking.Q: What warranty coverage applies to surplus stocked units?A: A 12-month limited warranty only covers factory manufacturing defects. Damage from mismatched redundant firmware, mixed-model CPU pairing, missing DCN termination resistors, ungrounded ESD handling, or cross-platform rack installation is excluded from warranty claims.Q: Can more than two units be paired for multi-level redundant control architectures?A: The hardware only supports a single active/standby two-card redundant pair per rack. Multi-rack redundant systems require separate paired CPU sets installed in distinct I/O subracks linked via DSBC176 bus extenders.Q: Is this main processor rated for Class 1 Div 2 hazardous cabinet deployment inside refinery pump MCC rooms?A: No, the open slide-in PCB rack design lacks intrinsic safety certification for flammable vapor environments. Flameproof dedicated control enclosures are required for hazardous area process plant installations.Q: What cable part numbers are approved for DCN network trunk runs with this controller?A: Only ABB TK570 shielded differential network cables meet OEM impedance specifications; generic unshielded twisted pair will introduce excessive signal reflection and cyclic DCN bus fault events.Q: What long-term hardware upgrade path exists as this component reaches ABB end-of-support status?A: Modern ABB distributed control deployments use AC800M controllers paired with S800 I/O and CI810B AF100 fieldbus interfaces to replace legacy Mod300 racks. Full Mod300 cabinet migration, removal of all subracks, and complete TCL/TLL control logic conversion to IEC 61131 are required for a direct functional retrofit.