Quick Sizing & Sourcing Snapshot
- Manufacturer: GE Fanuc (Emerson Automation Solutions)
- Part Number: IC200CHS022
- System Platform: GE VersaMax PLC / PACSystems (Micro & NIU Systems)
- Hardware Type: 12-Slot Universal Base / Chassis (Backplane Only — No Electronics)
- Architectural Role: Mechanical frame + printed-circuit backplane for up to 1 CPU/NIU + 1 Power Supply + 10 I/O modules (or 12 I/O modules if no CPU — used as expansion rack with IC200ERM001/002). Distributes +5V backplane power and the VersaMax parallel/expansion bus.
- Key Specifications: 12 Total Slots, Slot 0 = CPU/NIU, Slot 1 = Power Supply (IC200PWR001/002), Slots 2-11 = I/O (or Slots 1-12 = I/O in Expansion config), DIN Rail / Panel Mount.
System Architecture & Operational Principle
The is a passive VersaMax chassis operating at Purdue Level 1/2, providing the physical mount and electrical backplane for VersaMax modules.
Backplane Structure:
- Slot 0 (Leftmost): Designed for a CPU (IC200CPU001/002/005) or NIU (IC200NIC/NDM001 for Genius/Ethernet Interface). This slot has the bus master/arbiter connection.
- Slot 1: Designed for the Power Supply Module (IC200PWR001 — 120/240V AC in, 5V/24V DC out; or IC200PWR002 — 24V DC in). The P/S plugs in vertically and mates with the backplane to provide +5V DC for logic and sometimes +24V DC for field circuits (depending on I/O module).
- Slots 2–11: General-purpose I/O slots for IC200MDLxxx, IC200ALGxxx, IC200DDRxxx, etc.
- Expansion Use: If used as a remote expansion rack (no CPU), Slot 0 gets an IC200ERM001 (Isolated) or IC200ERM002 (Non-Isolated) Expansion Receiver Module, and Slot 1 still gets the Power Supply. All 12 slots (Slots 0-11 with ERM in 0, P/S in 1, I/O 2-11) or sometimes all 12 as I/O if ERM occupies a non-CPU designated slot in special daisy — but standard is ERM in Slot 0 for expansion.
Power Distribution: The IC200PWR001/002 supplies +5V DC to the backplane from Slot 1. It does notregulate field 24V DC — that is either supplied externally to the I/O terminal blocks or (on some modules) via a separate 24V DC bus if the P/S has a 24V output (PWR001 has limited 24V sensor power; check specs — usually external 24V DC is landed at the I/O TB).
Communication Bus: The backplane carries the VersaMax proprietary parallel bus for I/O scan and configuration. The CPU/NIU in Slot 0 arbitrates the bus, polling each I/O module every scan.
Core Technical Specifications
| Parameter | Value |
|---|---|
| Slot Count | 12 Total |
| CPU/NIU Slot | Slot 0 ( leftmost ) |
| Power Supply Slot | Slot 1 |
| I/O Capacity (Local) | Up to 10 I/O modules (Slots 2-11) with CPU/NIU |
| I/O Capacity (Expansion) | Up to 11 I/O modules (Slots 2-11) + ERM in Slot 0, P/S in Slot 1 |
| Backplane Voltage | +5V DC (Sourced from IC200PWR001/002 or Expansion Transmitter) |
| Mounting | 35mm DIN Rail (with clips) or Panel Mount (4x #10 screw holes) |
| Indicators | None on chassis (Power/Run/Err on CPU/P/S/Modules) |
| Material | Glass-reinforced thermoplastic / aluminum backplane |
| Operating Temp | 0°C to +60°C |
| Compatibility | All IC200 (VersaMax) CPUs, NIUs, Power Supplies, I/O Modules |
| Dimensions (HxWxD) | Approx. 120mm x 482mm x 75mm (4.7″ x 19″ x 3″) |
Customer Value & Operational Benefits
Mix & Match Density (Local + Expansion)
The 12-slot chassis lets you put a VersaMax CPU + up to 10 I/O modules in one rack — e.g., 160 discrete points + 8 analog channels + 2 comms modules. If you need more, add a second CHS022 as an expansion rack with an IC200ERM001 (Isolated) in Slot 0, connected via 26-pin cable from the CPU rack’s ETM001 (if CPU has it) or daisy from the first expansion rack. This scales from 16 points to 256+ points in 2 racks without migrating to RX3i/RX7i — ideal for mid-size machines and skid packages.
DIN Rail Flexibility (Reduced Panel Footprint)
Unlike the Series 90-30/90-70 heavy steel racks, the CHS022 snaps onto standard 35mm DIN rail. You can mount it sideways in a shallow NEMA enclosure or vertically in a compact MCC pocket. No panel-cut rectangular hole required (though panel mount holes are provided). This cuts enclosure size requirements by 30-40% vs a full 19″ rack mount 90-30 chassis in some applications.
Transparent I/O Addressing (CPU Scans All Slots)
The VersaMax CPU auto-detects modules in Slots 2-11 and assigns %I/%Q addresses sequentially (or per your hardware config). Expansion racks (with ERM) appear as additional Rack IDs but use the same simple address map. Maintenance staff don’t need to understand Genius Bus numbers or Profibus station IDs — just “Slot 3 = Inputs %I0016-0031”. Commissioning is faster.
