Technical Specifications:
Series: GE Fanuc 90-70 Genius I/O
Monitored Rails: Primary 24V DC and Secondary 24V DC (Redundant)
Voltage Thresholds: Configurable for each rail independently (Low: 20.4V, High: 28.8V)
Redundancy Status: Monitors ORing diode status and rail switching
Alarm Output: 1 Form C (SPDT) relay contact, 5A @ 250V AC
Communication: Reports full status to CPU via VMEbus (not just relay)
Backplane Interface: VMEbus
Operating Temperature: 0°C to +60°C
Power Consumption: < 2 Watts
Functional Features:
Dual Rail Monitoring: Independently monitors both the primary and secondary power rails of a redundant system, providing per-rail status.
ORing Diode Monitoring: Detects if the ORing diode has failed, which would compromise redundancy.
Rail Switching Detection: Reports to the CPU when a switchover from primary to secondary has occurred.
CPU Communication: Unlike the PSA100, the PSA350 sends detailed status data to the CPU via VMEbus, allowing the program to log events and take intelligent action.
Relay Alarm: Provides a hardwired alarm contact for external annunciation in addition to the software status.
Battery Monitor: Includes battery backup voltage monitoring (same as PSA100).
Performance Parameters:
Voltage Accuracy: ±0.25% (Better than PSA100)
Response Time: < 5ms (Faster than PSA100)
Relay Life: > 500,000 operations
MTBF: > 200,000 hours
Isolation: Each rail monitored independently with > 500V DC isolation
Material Composition:
Housing: Die-cast aluminum with EMI shielding (heavier duty than PSA100)
PCB: 4-layer FR-4 with isolated analog sections for each rail
Relay: High-reliability Form C relay, gold-plated contacts
Connectors: Dual terminal blocks, one for each rail sense
Structural Features:
Form Factor: Standard GE 90-70 module, approximately 40mm wide
Mounting: Any I/O slot
Front Panel: PRI OK (Green), SEC OK (Green), ALARM (Red), REDUNDANCY (Green) LEDs
Rear Panel: Two terminal blocks (Primary sense, Secondary sense), VMEbus connector, Alarm relay terminal
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