Product Core Brief

• Model:
• Brand: GE Fanuc / Emerson Automation
• Series: Series 90-30 PLC
• Core Function: Mid-range single-slot CPU for Series 90-30 main backplane. Executes control logic, manages local I/O and remote expansion racks. Equipped with dual front serial communication ports for programming, HMI and Modbus RTU communication.
• Product Type: Single-width Series90-30 Main Rack CPU Module
• Key Specs: 25 MHz Intel 80386EX processor | Max 240KB user memory (Firmware V9.0+) | Dual front serial ports + power supply serial expansion bus | Floating-point arithmetic support | -DF = Conformal coated PCB harsh environment variant Note: Discontinued legacy Series90-30 CPU; new original stock scarce, surplus & refurbished widely available. Standard non-coated base model: . CPU cannot support hot swap. Install only on IC693CHS391 / CHS392 Series90-30 backplanes. Cannot plug directly into RX3i IC695 racks. No onboard Ethernet, Ethernet communication requires separate IC693ETM001 module.

 

Key Technical Specifications

• Processor: 25 MHz Intel 80386EX
• Typical Boolean Scan Time: 0.22 ms per 1000 boolean contacts
• Supported Programming Languages: LD, FBD, ST, IL
• Memory Max 240 KB user logic/data memory (Firmware Release 9.0 and above) Earlier firmware limited to 80KB Flash program storage; IC693ACC301 lithium battery for RAM retention & RTC clock
• I/O Capacity Discrete: Max 4096 total (%I + %Q) Analog: Max 512 total (%AI + %AQ)
• Communication Interfaces PORT1: RS232 (Programming / SNP) PORT2: RS485 (SNP / Modbus RTU Master/Slave) Serial Expansion Bus: Utilizes power supply RS485 terminal for remote expansion racks
• Supported Protocols SNP/SNP-X, Modbus RTU Master/Slave
• Backplane Power Consumption 5 VDC: 890 mA
• Front Panel Hardware Switch: RUN / STOP / Memory Protect
• Front Panel LEDs: CPU OK, RUN, SYS FLT, PORT1, PORT2
• Operating Temperature: 0°C ~ +60°C horizontal cabinet mounting
• Storage Temperature: -40°C ~ +85°C
• Form Factor: Single-width module for IC693 Series90-30 backplane
• Compatible Baseplates: IC693CHS391 (5-slot), IC693CHS392 (10-slot)
• Maximum Rack Scale: Up to 8 racks total (main rack + 7 expansion racks)
• Supported Software: Logicmaster 90, Proficy Machine Edition
• Agency Certifications: UL508, Class I Div.2, CE

 

Product Introduction

is conformal coated mid-range CPU for Series 90-30 control systems. Suffix Explanation

• : PCB conformal coated variant, enhanced protection against humidity, dust, chemical vapors for corrosive, high-humidity cabinet environments
• : Standard commercial non-coated version Electrical, firmware and pinout fully identical, mechanically plug interchangeable.

Important CPU Family Comparison

1. : Conformal coated serial-only CPU, no onboard Ethernet
2. IC693CPU364: Built-in single 10M Ethernet port
3. IC693CPU374-GU: Flagship 133MHz dual switched Ethernet CPU

Critical Limitation No integrated Ethernet. If Ethernet networking is required, you must install IC693ETM001 Ethernet communication module into a spare rack slot. PORT2 RS485 can be configured as Modbus RTU master or slave, widely used to connect variable frequency drives, field instruments and third-party HMIs.

 

QA & Testing SOP (Transparency Building)

1. Incoming Inspection: Verify part marking and -DF conformal coated suffix. Inspect backplane gold pins for oxidation/bending; check housing integrity, avoid scratching conformal coating.
2. Live Testing: Mount validated IC693 power supply onto IC693CHS backplane. Apply rack power, download test program, verify PORT1/PORT2 serial communication, confirm module recognition in Proficy Machine Edition, run continuous 24-hour rack stability test.
3. Electrical Testing: Monitor backplane 5V rail stability; insulation resistance ≥10MΩ between circuits and chassis protective ground.
4. Documentation: Photograph serial port wiring layout and front panel switch position before disassembly; record hardware revision.
5. Final QC & Packaging: Place unit inside anti-static shielding. Attach dated QC test tag confirming serial communication and backplane bus validation prior to shipment.

 

Installation Pitfalls & Guide

❗ No Hot Swap Support: CPU module cannot be hot swapped. Full rack power shutdown mandatory before removal. ❗ Dedicated Power Slot Rule: Slot0 must be occupied by IC693PWR series power supply; CPU cannot supply backplane logic power. ❗ RS485 Wiring Guidance: Use shielded twisted pair cable for PORT2; single-point shielding ground to prevent ground loops. ❗ Conformal Coating Care: Avoid scraping PCB coating during handling; damaged coating loses environmental protection capability. ❗ Battery Maintenance: IC693ACC301 lithium battery preserves retentive variables and RTC; periodic replacement prevents data loss after power cycle. ❗ Memory Planning: Available user memory depends on configured %R, %AI, %AQ register allocation. ❗ ESD Risk: Static discharge damages serial transceivers and logic circuits, leading to intermittent communication failures.

Replacement Guide

1. Pre-install: Lockout-tagout rack power; back up complete PLC project and hardware configuration. Photograph slot arrangement and serial wiring mapping.
2. Removal: Power off rack, disconnect all serial communication cables, unlatch CPU and slide straight out without damaging backplane pins.
3. Instew into original slot on IC693CHS backplane, replicate all field serial wiring connections.
4. Power-on Test: Restore rack power; confirm CPU OK LED steady, connect Proficy Machine Edition, download control program, verify I/O scanning and serial communication function.

 

FAQ

es support hot swapping? A: No. Series90-30 CPU modules cannot be hot swapped. Full rack power shutdown required before removal.

Q: What does the -DF suffix stand for? A: -DF = Conformal coated PCB variant for harsh industrial environments. Functionally identical to standard , fully plug compatible.

Q: Does this CPU have built-in Ethernet? A: No. Ethernet communication requires separate IC693ETM001 Ethernet module.

Q: Can PORT2 run Modbus RTU? A: Yes, supports Modbus RTU Master or Slave via PME configuration.

Q: ll directly into RX3i IC695CHS007 rack? A: No. Mechanical and backplane bus incompatible. It only works on native IC693 Series90-30 backplanes.

Q: How many expansion ne support? A: Maximum 8 racks total (main rack + up to 7 expansion racks).

Q: Will program automatically remain after CPU replacement? A: Program must be downloaded from Proficy Machine Edition to the new CPU. Always back up project before CPU replacement.