Model Interpretation

IC693: Series 90-30 PLC system

CPU: Central Processing Unit

331: Entry-level performance (10 MHz, 16 KB memory)

Technical Parameters

Processor & Performance

CPU: Intel 80188 (16-bit)

Clock Speed: 10 MHz

Scan Rate: 0.4 ms per 1K Boolean logic

User Program Memory: 16 KB RAM

Register Memory: 2,048 words

I/O Capacity:

Discrete: 512 inputs / 512 outputs

Analog: 128 input words / 64 output words

Expansion Racks: Up to 5 (1 local + 4 remote)

Communication

Onboard Serial: RS-485 (SNP/SNP-X slave only)

No onboard Ethernet (requires expansion module)

Electrical

Power: +5 VDC, 350 mA

Battery-backed RTC: Yes (for data retention)

Mechanical & Environmental

Dimensions (W×H×D): ~150 × 100 × 30 mm

Weight: ~0.34 kg

Operating Temp: 0°C to +60°C

Storage Temp: -40°C to +85°C

Humidity: 5–95% non-condensing

Internal Memory & Resources

Discrete Global Memory: 1,280 bits

Internal Coils: 1,024 bits

Timers/Counters: 680

Shift Registers: Supported

Override Function: Yes

Core Functions

Logic Execution: Runs ladder logic for small automation tasks.

I/O Control: Manages up to 1,024 discrete and 192 analog points.

Serial Communication: Connects to HMI/SCADA via SNP/SNP-X.

Data Retention: Battery-backed memory preserves data during power loss.

Diagnostics: Status LEDs for power, run, and fault indication.

Applications

Small Manufacturing: Conveyors, packaging, assembly lines

Building Automation: HVAC, lighting control

Water/Wastewater: Pump stations, small treatment plants

OEM Equipment: Machine tools, textile machinery

General Industrial: Compact process skids, material handling

Usage & Maintenance

Installation: Plug into Series 90-30 baseplate (CPU slot only); secure with screws.

Programming: Use Proficy Machine Edition or VersaPro.

Battery: Replace every 3–5 years to protect memory.

Compatibility: Works with all Series 90-30 I/O modules; not compatible with 90-70 series.

Status LEDs: POWER (green), RUN (green), FAULT (red), COMM (yellow).

Key Differences from IC693CPU350

CPU331: 10 MHz, 16 KB memory, RS-485 only, entry-level

CPU350: 25 MHz, 32 KB memory, faster scan rate, mid-range