GE IC693 Series Modules — IC693PBS201 PROFIBUS-DP Slave Communication Module

Technical Dossier

Product Details And Specifications

GE IC693 Series: Comprehensive Module Range and Technical Overview

The GE IC693 series — commercially designated as the Series 90-30 PLC — is a rack-based programmable logic controller platform developed by General Electric Automation & Controls (subsequently Emerson Automation Solutions post-acquisition). It has accumulated one of the largest installed bases in global heavy industry, with documented deployments in petrochemical refineries, nuclear power auxiliary systems, offshore oil & gas platforms, pulp and paper mills, and municipal water treatment facilities. The platform's modular backplane architecture (5-slot, 10-slot, and expandable configurations) and broad I/O density made it the default choice for mid-range process automation from the early 1990s through the 2010s. The IC693PBS201 specifically addresses PROFIBUS-DP slave communication, enabling the Series 90-30 rack to operate as a field device node on PROFIBUS networks — a critical integration requirement in mixed-vendor DCS environments common in European and Asian heavy industry installations.

The Evolution of IC693 Architecture

The IC693 platform was introduced in the early 1990s as GE Fanuc Automation's mid-range successor to the Series Six and Series Five PLC lines. The original architecture centered on the IC693CPU311 and IC693CPU313 processors, which used a proprietary backplane bus operating at 5V TTL logic levels. These early CPUs supported ladder logic exclusively and communicated via RS-232/RS-485 serial ports using GE's SNP (Serial Network Protocol) and SNPX protocols.

The mid-generation refresh introduced the IC693CPU340 and IC693CPU350 processors with expanded memory (up to 240KB user program), floating-point math coprocessors, and Ethernet TCP/IP capability via the IC693CMM321 Ethernet Interface Module. This generation also introduced the IC693BEM331 Genius Bus Controller, enabling integration with GE's proprietary Genius I/O field bus — a token-passing network widely deployed in automotive and chemical plant applications.

The mature generation, represented by the IC693CPU374 and IC693CPU375, added support for IEC 61131-3 programming languages (Function Block Diagram, Structured Text, Sequential Function Chart) alongside legacy ladder logic. The IC693PBS201 was introduced during this period to address the growing prevalence of PROFIBUS-DP in European process industries, allowing Series 90-30 racks to participate as slave nodes in PROFIBUS networks managed by third-party DCS masters (Siemens, ABB, Honeywell). Compatibility constraints are significant: the IC693PBS201 requires firmware revision 1.10 or higher on the host CPU and is not compatible with the original IC693CPU311/313 processors without a firmware upgrade path. Backplane slot assignment follows standard IC693 rules — the module occupies one I/O slot and maps to a configurable GSD file for PROFIBUS master configuration.

The IC693 series entered the mature/end-of-life phase circa 2015–2018, with GE (and subsequently Emerson) formally discontinuing new production of most modules. The platform is now supported exclusively through third-party spare parts suppliers and authorized repair centers. Long-term maintenance support — including board-level repair, firmware restoration, and functional testing — is the primary procurement mode for existing installations.

IC693 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC693CPU311: Series 90-30 base CPU, 6KB program memory, SNP/SNPX serial comms, no floating point
• IC693CPU313: Enhanced base CPU, 12KB program memory, dual serial ports, ladder logic only
• IC693CPU323: Mid-range CPU, 32KB memory, expanded I/O addressing, RS-485 SNP port
• IC693CPU340: Advanced CPU, 80KB memory, floating-point math, dual serial ports
• IC693CPU350: High-performance CPU, 240KB memory, IEC 61131-3 support, Ethernet-ready
• IC693CPU360: Enhanced CPU with expanded data table, 240KB, dual Ethernet option
• IC693CPU374: Top-tier CPU, 512KB program + 512KB data, full IEC 61131-3, Ethernet TCP/IP onboard
• IC693CPU375: CPU374 successor with enhanced scan time performance and extended memory addressing

Discrete Input Modules

• IC693MDL230: 8-point 120VAC discrete input module, isolated, DIN rail compatible
• IC693MDL240: 16-point 120VAC discrete input, standard density, screw terminal
• IC693MDL241: 16-point 24VDC discrete input, positive logic, high-speed capable
• IC693MDL260: 32-point 24VDC discrete input, high-density, grouped commons

Discrete Output Modules

• IC693MDL310: 8-point relay output, Form C contacts, 2A per point, 120/240VAC
• IC693MDL340: 16-point 120VAC triac output, isolated, 0.5A per point
• IC693MDL752: 32-point 24VDC transistor output, sourcing, high-density

Analog I/O Modules

• IC693ALG220: 4-channel analog input, 4–20mA / 0–10V selectable, 12-bit resolution
• IC693ALG390: 8-channel analog input, 12-bit, current/voltage configurable per channel
• IC693ALG442: 4-channel analog output, 12-bit, 4–20mA / 0–10V, isolated

Communication & Network Modules

• IC693PBS201: PROFIBUS-DP slave interface, GSD-configurable, up to 244 bytes I/O, 12Mbps max
• IC693BEM331: Genius Bus Controller, master/slave configurable, 32-device bus capacity
• IC693CMM321: Ethernet TCP/IP interface, 10BaseT, SRTP and Modbus TCP support
• IC693CMM311: Serial communications module, RS-232/RS-485, SNP/SNPX/Modbus RTU

Power Supply Modules

• IC693PWR321: 120/240VAC input power supply, 30W output, standard rack
• IC693PWR322: 24VDC input power supply, 30W, for DC-powered panel installations
• IC693PWR330: High-capacity 120/240VAC supply, 40W, for fully populated 10-slot racks

Sourcing Hard-to-Find & Obsolete IC693 Parts

The IC693 series is formally discontinued by the OEM. New production units are no longer available through authorized GE/Emerson distribution channels. For facilities operating Series 90-30 systems beyond the OEM support window, DriveKNMS maintains a dedicated inventory of pulled, refurbished, and new-surplus IC693 modules sourced from decommissioned plant equipment, authorized liquidations, and long-term storage stock.

DriveKNMS provides lifecycle extension support for the IC693 platform including: identification and cross-referencing of obsolete part numbers to current equivalents where applicable; sourcing of specific firmware revisions required for legacy CPU compatibility; and procurement of complete rack assemblies for facilities requiring like-for-like replacement without system redesign. The IC693PBS201 and other communication modules are among the highest-demand obsolete items due to the difficulty of retrofitting PROFIBUS integration into replacement platforms without significant engineering cost. Inquiries for bulk quantities, long-term supply agreements, or emergency replacement sourcing are handled directly by the DriveKNMS technical sales team.

Quality Control for the IC693 Range

IC693 modules present specific test challenges due to the proprietary backplane bus protocol and the age-related failure modes common in 20–30 year old industrial electronics. DriveKNMS applies a structured test protocol to all IC693 inventory prior to shipment.

Each module undergoes visual inspection for capacitor bulge, PCB trace corrosion, and connector pin integrity — failure modes prevalent in modules stored in high-humidity environments. CPU modules are bench-tested using a dedicated Series 90-30 test rack with a known-good backplane, verifying program load/execute cycles, serial port communication at all supported baud rates, and memory retention across power cycles. Communication modules including the IC693PBS201 are tested for PROFIBUS-DP slave enumeration using a PROFIBUS master simulator, verifying correct GSD parameter exchange, I/O data mapping, and bus termination behavior at 1.5Mbps and 12Mbps. Analog I/O modules are calibrated against NIST-traceable reference standards with full-range linearity verification. All modules are powered for a minimum 24-hour burn-in period before final packaging. Test records are retained and available upon request for quality-critical procurement.