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APCI-035 Watchdog board

APCI-035 Watchdog board

Quick Overview

Watchdog board, optically isolated, 4 watchdogs/timers
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The board APCI-035 is equipped with 4 watchdogs which can monitor software and hardware tasks independently from each other. Watchdog 1 works with 2 alarm levels and can be programmed with 1 of 4 different time units (µs, ms, s, min). In case of error, watchdog 1 warns the PC or the peripheral.

If the error is not removed, the alarm level 2 is automatically triggered after a defined timeout and prepares the system and the peripheral for a hardware reset.
The alarm levels are controlled through 1 trigger channel and 4 different time bases. The internal PC temperature can be monitored through the onboard temperature sensor.

  • 4 watchdogs, timers
  • Activation through software
  • Optical isolation 500 V
  • Reset time: 2 s
  • Time base Watchdog/Timer: µs, ms, s, min
  • Temperature monitoring: precision ± 2°C measuring range
      -45°C to 135°C (practical range 0-60°C)


Addressing: 32-bit
Addressing range: 256 Byte
Interrupt: Über BIOS
Optical isolation: 500 V (from the PC to the peripheral)


Depth: 8-bit
Switching time of the reset relays: 2 s
4 x programmable watchdogs/timers: Time selectable from 2 μs to 255 min
Time units: μs, ms, s, min

Temperature monitoring

Accuracy: ± 2 °C
Measurement range: -45 °C to 135 °C (real range of application 0-60 °C)
Resolution: 8-bit

Relay data

Type of contacts: 2 change-over contacts
Max. switching voltage: 60 VAC, 48 VAC
Max. switching current: 1 A
Max. switching capacity: 62.5 VA, 30 W
Min. permissible load: 1 mA / 5 VAC
Nominal load: 1 A 24 VAC
Contact resistance: < 100 mΩ
Contact material: Ag + Au-plated
Responding time: max. 5 ms, typ. 2.5 ms
Release time: max. 5 ms, typ. 0.9 ms
Mechanical life: 5 x 106 operations
Electrical life at 24 V: 105 operations

Digital input

Nominal input current at 24 V: 6 mA
Nominal input voltage: 24 V
Switching threshold: >16 V for logical "1".

Physical and environmental conditions

Dimensions: 120 x 85 mm
System bus: PCI 32-bit 3.3/5 V acc. to spec. 2.2 (PCISiG)
Space required: 1 PCI slot
Operating voltage: +5 V, ± 5 % from the PC
Current consumption: 240 mA ± 10 % typ.
Front connector: 9-pin SUB-D male connector
Temperature range: 0 to 60 °C (with forced cooling)

Availability: Stock Item


Components / Downloads

For further information, technical advice, or a quotation please call or email us. If you are not sure which product you need one of our technical sales advisors will be happy to discuss your application. We also accept company purchase orders by fax or post. Credit card orders can also be placed over the phone for any product.

Watchdog board: peripheral, software and temperature monitoring for multitasking operating systems
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