Allen-Bradley MKS-CIT AS00224 Modules – 0190-22543 MKS-CIT AS00224-03

Technical Dossier

Product Details And Specifications

Allen-Bradley MKS-CIT AS00224 Series Technical Notes

The Allen-Bradley MKS-CIT (AS00224) series comprises customer-specific packaged circuit board assemblies and screened board sub-assemblies manufactured by Rockwell Automation for integration into legacy DCS and PLC control architectures. These boards are deployed across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, offshore oil & gas platforms, and continuous-process chemical plants. The MKS-CIT designation identifies boards that have undergone customer-specific configuration, inspection, and screening (SP-SCRGD) prior to shipment, making them direct drop-in replacements for field-installed units without additional calibration. Their long service life in safety-critical environments has created sustained demand for spare and replacement units well beyond the original production window.

The Evolution of MKS-CIT AS00224 Architecture

The AS00224 board family was developed as part of Rockwell Automation's modular backplane ecosystem for the 1770, 1771, and 1785 PLC-5 platform generations. Early revisions (Rev -01, -02) used through-hole component technology with discrete logic ICs and were designed for direct rack-mount integration. Revision -03 (the current subject: 0190-22543 MKS-CIT AS00224-03) introduced surface-mount technology (SMT) on critical signal-path sections, improving noise immunity in high-EMI industrial environments. Subsequent revisions addressed field-reported issues with bus termination impedance and EEPROM data retention under thermal cycling. As the PLC-5 platform entered its end-of-life phase (Rockwell announced discontinuation of PLC-5 hardware support in 2022), the AS00224 series transitioned fully into the legacy/obsolete category. No direct form-fit-function replacement exists within the current ControlLogix or CompactLogix product lines without a full system migration. This makes long-term spare parts sourcing the primary strategy for facilities maintaining existing installations.

MKS-CIT AS00224 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented range of the MKS-CIT / AS00224 board assembly series and associated Allen-Bradley PLC-5 platform spare board components. Each entry reflects a distinct revision, configuration, or functional variant:

0190-22543 MKS-CIT AS00224-03: Rev-03 screened customer SP board assembly, SMT signal path, rack-mount compatible
0190-22543 MKS-CIT AS00224-01: Rev-01 through-hole baseline board, early PLC-5 backplane integration
0190-22543 MKS-CIT AS00224-02: Rev-02 intermediate revision, updated bus termination resistor network
0190-22543 MKS-CIT AS00224-04: Rev-04 field-updated EEPROM retention improvement, thermal cycling hardened
1771-OBD: 16-point 24VDC discrete output module, PLC-5 rack compatible
1771-IBD: 16-point 24VDC discrete input module, direct backplane interface
1771-IFE: 8-channel analog input module, 4–20mA / 0–10V configurable
1771-OFE1: 4-channel analog output module, 4–20mA isolated outputs
1771-ASB: Remote I/O adapter sub-system board, 1771 chassis interface
1771-P4S: Power supply module, 5VDC backplane, 4A rated
1785-L40B: PLC-5/40 processor module, 40K word user memory
1785-L80B: PLC-5/80 processor module, 80K word user memory, enhanced instruction set
1785-L20B: PLC-5/20 processor module, 16K word, DH+ and Remote I/O ports
1785-ME16: 16K word EEPROM memory module for PLC-5 processors
1771-SDN: DeviceNet scanner module, 1771 backplane, 64-node capacity
1771-KE: RS-232/DH+ communication interface module
1771-KF2: DH+ / Remote I/O communication adapter module
1771-WB: Wiring arm / terminal block assembly for 1771 I/O modules
1771-CX1: I/O chassis interconnect cable, 1771 series
1771-A2B: 4-slot I/O chassis, 1771 platform, single-ended power