Description
The 900C72-0144-00 is a C70 Controller CPU module from Honeywell, the high-performance processor of the HC900 / ControlEdge HC900 hybrid control platform. It is the execution engine of the system: the module that runs the PID loops, the discrete logic, the sequencers and the communications for an entire process unit.
Built on a 32-bit RISC PowerPC architecture with 128 MB of ECC-protected, battery-backed DDR2 memory, the 900C72-0144-00 is the CPU tier above the C30 and C50, offering up to 15,000 function blocks, dual independent Ethernet ports and support for up to 4,608 I/O points over remote racks. It is configured in Honeywell’s Hybrid Control Designer and speaks Modbus TCP natively, so it drops into SCADA, HMI and Experion architectures without a gateway.
Application Scenarios
A pharmaceutical fermentation plant runs a suite of bioreactors where temperature ramping, pH control, feed sequencing and safety interlocks must all execute together, batch after batch, with the batch record admissible as evidence. The plant’s older controllers began to show scan-time creep during peak production: as more loops and recipe steps were added, the controller’s execution stretched, and operators faced the possibility of an off-spec batch worth hundreds of thousands of dollars.
The remedy was a move to the 900C72-0144-00. Its dual-scan architecture separates a fast digital/scan-critical pass from the normal analog pass, and the C70 tier’s 15,000 function block capacity means the recipe logic, the 200-plus analog loops and the interlock ladder all live in one controller rather than being split across a PLC and a bank of temperature instruments. When a batch deviation is later investigated, the module’s sequence-of-events logging resolves the order of interlock activations to 1 ms — enough to distinguish a sensor failure from an operator action, which is what turns a deviation report from guesswork into a root cause.
The second, quieter value is continuity. This plant’s entire configuration — every loop, tag name, annotation and recipe — is held in the controller’s flash memory. Swapping in a 900C72-0144-00 with the matching YY-44 revision restores the whole strategy without a re-engineering project, which is the difference between a spare part and a capital replacement.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 900C72-0144-00 (Controller C70 CPU; the “44” in the model number is the compatibility revision that must match the rest of the system) |
| Manufacturer | Honeywell |
| Product Category | Controller CPU module — hybrid loop and logic processor for the HC900 / ControlEdge HC900 platform |
| Processor Architecture | 32-bit RISC PowerPC (e300 family); program execution protected by an independent watchdog timer with independent clocks |
| Memory | 128 MB DDR2 operating memory with ECC circuitry for error detection and correction; battery-backed for dynamic data, flash memory for permanent configuration storage |
| Battery Backup | Proven TL5903 primary battery sustaining up to 24 days of continuous power outage, so a long shutdown does not cost you the running state |
| Function Block Capacity | Up to 15,000 function blocks on the C70 tier (C50 = 2,000; C30 = 400) — room for PID, logic, math, sequencing and recipes in one controller |
| Maximum I/O Capacity | Up to 4,608 points with remote I/O: 1,152 universal analog inputs or 2,304 high-level analog inputs, 480 analog outputs, 4,608 digital inputs and outputs |
| Scan Performance | Fast scan as low as 10 ms local and from 25 ms with remote I/O; normal analog scan typically 100 ms; separate fast and normal scan engines with user-set execution order |
| Control Algorithms | PID with Accutune III auto-tuning and fuzzy-logic overshoot suppression, plus cascade, ratio, carbon potential, dew point and humidity variants; 1oo2 and 2oo3 voting and output-validation blocks |
| Communication Ports | Two independent 10/100Base-T Ethernet ports plus isolated RS-485; Modbus TCP/IP master and slave, Modbus RTU, peer-to-peer UDP with up to 32 peer controllers |
| Sequence of Events | 1 ms resolution SOE timestamping with 5,000-event buffering, for defensible trip and interlock analysis |
| Redundancy | Non-redundant CPU by design — the 900C72-0144-00 is a simplex controller; CPU redundancy is provided by the C70R (900C72R) and C75 tiers. Power supply and network redundancy are supported around it |
| Power & Mounting | 24 V DC supplied from the HC900 rack power supply (900P01, 900P02 or 900P24); mounts in 4-, 8- or 12-slot HC900 racks |
| Physical & Environmental | Approx. 137 × 38.1 × 151.7 mm, 0.454 kg; operating 0 °C to +60 °C, storage −40 °C to +85 °C; 5–95 % RH non-condensing; open-style unit for panel or cabinet installation |
| Certifications | CE, UL, CSA, FM, RoHS; Class I Div 2 on selected configurations |