1. Product Overview

1. Backplane bus gateway between Ovation DPU controller and SUB8 series local I/O rack;

2. Dual-channel RS485 Modbus-RTU gateway for third-party instruments, transmit peripheral device data into Ovation DCS system.

   Mainly used for thermal power boiler/turbine auxiliary cabinet, petrochemical unit auxiliary control SUB8 I/O cabinet.

Difference vs 3A99158G01: G02 optimizes onboard communication chip & EMC circuit, enhances anti-interference for long-distance RS485 bus, fixes early version bus surge fault defect, full hardware pin-to-pin compatible with G01, direct interchangeable replacement without cabinet modification.

2. Electrical Technical Parameters

• Power Supply: +5VDC / ±12VDC powered via SUB8 rack backplane, typical power consumption ≤5W

• SUB8 Local Bus: Ovation proprietary SUB8 high-speed I/O bus, max 8 slots SUB8 I/O cards driven per single module

• Serial Interface: Dual isolated RS485 independent channel, Modbus-RTU standard; Baud rate:300~38400bps, max transmission distance 1200m

• Onboard auxiliary loop power: Isolated 48VDC limited-current power for DI dry contact field wetting

• Protection: Upgraded overvoltage, reverse wiring, EMC surge, bus short-circuit automatic cutoff protection (improved from G01)

3. Mechanical & Environmental Spec

• Form: Standard European plug-in card for Ovation SUB8 rack, same dimension as G01

• Dimension:260×100×25mm; Net weight≈0.36kg

• Operating Temp: -40℃ ~ +72℃; Storage Temp:-45℃~+85℃

• Humidity:5%~95%RH non-condensing; CE & IEC industrial anti-interference certification

4. Key Features

1. Full hot-swap support: Online plug/unplug without rack power cut, no I/O & Modbus communication interruption during maintenance

2. Redundancy configurable: Dual-card redundant running for critical control rack, standby module seamless auto-switchover upon main card failure

3. Front panel LED: POWER、BUS RUN、COM STATUS、FAULT four indicator lamps for quick fault locating

4. Optimized self-diagnosis: Upgraded MCU real-time detect SUB8 bus offline, RS485 short/open circuit, abnormal communication; upload fault code to DPU for system alarm display

5. Dual configurable mode: Software switch between pure SUB8 local I/O interface or independent Modbus gateway via Ovation control configuration tool

5. Typical Application

1. Thermal power plant coal mill, induced draft fan, feedwater pump SUB8 auxiliary I/O cabinet;

2. Petrochemical intelligent transmitters, valve positioner, PLC equipment Modbus-RTU access to Ovation DCS;

3. Metallurgy, municipal sewage treatment DCS serial device networking access.

6. Installation & Maintenance Notes

1. Directly plug into standard SUB8 rack dedicated slot, lock front buckle to prevent loose contact caused by equipment vibration;

2. Important process cabinet recommend dual redundant 3A99158G02 layout;

3. Annual maintenance: Dust cleaning on PCB, inspect golden finger oxidation and RS485 terminal wiring tightness;

4. Avoid hot plug when RS485 bus is fully loaded with multiple field instruments to prevent instantaneous impulse damage.