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Honeywell · PLC controller
900C51-0021 is a Honeywell PLC controller with Total I/O Up to 4608 with remote I/O; Supply voltage 24 V DC (IEC 61131-2); Enclosure rating IP20 (IEC 60529). It is used in packaging machines, conveyor transfer cells, small process skids where the installed unit is matched to the original catalog number and a compact, documented part is required.
| Electrical | |
| Supply voltage | 24 V DC (IEC 61131-2) |
|---|---|
| I/O and communication | |
| Communication ports | 1 Ethernet port, 10/100 Mbps |
| Total I/O | Up to 4608 with remote I/O |
| Mechanical | |
| Dimensions (H x W x D) | 137 mm x 38.1 mm (5.4 in x 1.5 in) |
| Weight | 360 g |
| Mounting | 35 mm DIN rail (IEC 60715) |
| Enclosure rating | IP20 (IEC 60529) |
| Environment and compliance | |
| Operating temperature | 0...+55 °C (IEC 60068-2-1) |
| Certifications | CE, cULus |
Values follow the Honeywell PLC controller specification for this catalog number; parameters not confirmed for this variant are omitted rather than estimated.
| Honeywell PLC controller variants | |||
| Catalog number | Total I/O | Supply voltage | |
|---|---|---|---|
| 900C51-0021 (this page) | Up to 4608 with remote I/O | 24 V DC (IEC 61131-2) | |
| 900C51-0011 | Up to 4608 with remote I/O | 24 V DC (IEC 61131-2) | |
| 900C51024300 | Up to 4608 with remote I/O | 24 V DC (IEC 61131-2) | |
| 900C50036000 | Up to 4608 with remote I/O | 24 V DC (IEC 61131-2) | |
Before selecting an alternative, confirm its dimensions, terminals and installation requirements in the manufacturer documentation.
The 900C51-0021 is the device-level element in a Honeywell PLC controller installation. It receives the field signals and control supply listed above — 24 V DC (IEC 61131-2) — and switches or conditions the load within the the rated ratings shown in the Specifications table. Wiring and protective devices are sized to those same numbers, not to a generic assumption.
Typical installations place it in packaging machines, conveyor transfer cells, small process skids, where the unit is matched to the original catalog number and the enclosure provides 35 mm DIN rail (IEC 60715) support. Record the catalog number and revision from the nameplate of the installed unit before specifying a like-for-like spare.
Honeywell 900C51-0021 — PLC / CPU module used as the device-level control core in an automation panel, handling logic, timing and communication tasks. The figures below are taken from the specification table on this page for catalog number 900C51-0021; verify the catalog number against your bill of materials before requesting a quotation.
Cross-check the ratings above with the installed device before confirming the order.
Q.Which value is published under communication ports for catalog number 900C51-0021?
For 900C51-0021, communication ports is given as 1 Ethernet port, 10/100 Mbps. Compare it with the nameplate of the installed unit before ordering.
Q.Before ordering 900C51-0021, which mounting entry should be checked?
The mounting entry quoted above is 35 mm DIN rail (IEC 60715). Confirm this figure against the unit currently in the panel.
Q.Where can I find the certifications data for 900C51-0021?
It is listed in the specification table for Honeywell 900C51-0021 as CE, cULus. Use the value as the reference when sourcing a current-production equivalent.
Q.Can the 900C51-0021 replace the unit currently installed in my panel?
Compare catalog number 900C51-0021 and the ratings above with the nameplate of the installed device. A current-production equivalent is selected by function and electrical rating, not by the label alone.
Q.How do I confirm compatibility of 900C51-0021 before ordering?
Match the catalog number 900C51-0021 and the specification values listed above against the installed unit, then confirm the firmware or hardware revision where a revision-sensitive part is involved.
Standard (US & Canada, tracked courier): delivered in 5–8 business days. In-stock items are processed within 2–4 business days. USD 25 flat rate on orders under $500.00; free on orders of $500.00 and above.
Express (DHL Express / FedEx International): upgraded expedited delivery in 2–4 business days. The Express surcharge is calculated at checkout based on destination and order weight.
Non-Stock / On-Order items ship on request: dispatch time is confirmed before your order — see our Shipping Policy. Shipping charges and available services are displayed at checkout. See the Shipping Policy for details.
Every product is covered by a 12-month seller warranty provided by SHLY-PLC, effective from the date of delivery, against defects in materials and workmanship under normal use.
This warranty does not cover damage from misuse, improper installation, power surges, neglect, unauthorized repair, or normal wear and tear. See our Return Policy for warranty-claim instructions.
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