Acromag AVME9431-i-L Isolated Digital Output

The Acromag AVME9431-i-L is a VMEbus-compatible isolated digital output module delivering 64 channels of solid-state relay switching for industrial control applications. Each channel is individually isolated from the VMEbus and from other channels, protecting against voltage transients and electrical noise in harsh environments. The module supports both source and sink configurations on a per-channel basis, enabling direct interfacing with valves, relays, indicator lamps, and other industrial actuators.

On-board thermal protection with status bits and selectable channel reset functionality ensure safe operation across temperature extremes.

Technical Specifications

• Output Channels: 64 digital outputs configured as four 16-bit words


• Output Type: Solid-state relays (SPST-NO, Form A)


• Isolation: Each channel individually isolated from VMEbus at 250V AC or 354V DC continuous; channels isolated from each other at 125V AC or 125V DC continuous; withstands 1500V AC surge for 60 seconds and 1250V AC dielectric strength test for one minute


• Output Voltage (off): 0 to 55V with maximum leakage current of 5µA DC


• Output Current (on): 0 to 1A DC at 0 to 40°C; derate 10mA/°C above 40°C


• Output Voltage (on): 0.5V DC maximum at 1A DC


• Response Time: 2.0mS maximum at 1A DC


• Logic Interface: TTL and CMOS compatible


• VMEbus: A24/A16:D16/D08 (EO) DTB slave; address modifiers 29H, 2DH, 39H, 3DH; access time 590nS typical


• Power: +5V DC at 2.5A maximum (all outputs ON with LEDs)


• Output Fuses: 64 x 2A fuses (F1-32)


• Operating Temperature: 0 to 70°C


• Thermal Setpoints: Low limit 69°C typical; high limit 79°C typical

Key Features

• 64 red LED indicators for channel status (with -L option)


• Individual source/sink configuration per channel


• Per-channel fusing for fault isolation


• Meets VME Specifications revision C.1 (October 1985) and IEC 821-1987

Typical Applications Industrial automation, process control systems, equipment interlocking, and distributed relay switching in environments requiring galvanic isolation between field devices and backplane logic.

Compatibility & Integration Standard or short address space occupancy of 1K byte; DIN 41612 Type C connectors (96-pin P1, 64-pin P2 rows A and C).