Technical Specifications:
Series: GE Fanuc 90-70 Genius I/O
Monitored Voltage: 24V DC backplane power
Voltage Thresholds: Configurable high/low alarm points (typically 20.4V low alarm, 28.8V high alarm)
Battery Monitor: Monitors IC697ACC901/902 battery voltage and status
Alarm Output: 1 Form C (SPDT) relay contact, rated 5A @ 250V AC / 5A @ 30V DC
Backplane Interface: VMEbus
Operating Temperature: 0°C to +60°C
Power Consumption: < 1 Watt (from backplane)
Functional Features:
Dual Voltage Monitoring: Simultaneously monitors the main 24V DC bus and the battery backup voltage.
Configurable Thresholds: High and low voltage alarm setpoints are configured via CPU software, allowing customization for different power supply tolerances.
Relay Alarm Output: Provides a dry contact relay that closes when an alarm condition is detected, enabling connection to external alarm annunciators, sirens, or SCADA systems.
Battery Health Check: Detects battery voltage drop below the warning threshold (typically 2.4V per cell) and signals replacement.
No CPU Overhead: All monitoring is performed by dedicated hardware on the PSA100 module; the CPU is only notified when an alarm occurs.
Performance Parameters:
Voltage Accuracy: ±0.5% of reading
Response Time: < 10ms from fault detection to relay activation
Relay Life: > 100,000 operations (mechanical)
MTBF: > 150,000 hours
Isolation Voltage: Monitor inputs to backplane > 500V DC
Material Composition:
Housing: Flame-retardant polycarbonate (UL94 V-0)
PCB: 2-layer FR-4 with precision voltage reference ICs
Relay: Omron or equivalent miniature power relay, silver-cadmium oxide contacts
Connectors: Spring-loaded terminal blocks for easy wiring
Structural Features:
Form Factor: Standard GE 90-70 module, approximately 40mm wide
Mounting: Any I/O slot in the PLC chassis
Front Panel: POWER OK (Green), ALARM (Red) LEDs
Rear Panel: VMEbus edge connector, 3-wire terminal block (24V sense, Alarm COM, Alarm NO)
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