INDUSTRIAL I/O PACK SERIES
AVME9675A
VME64x bus 6U CARRIER BOARD
Acromag, Inc. Tel: 248-295-0310
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http://www.acromag.com
- 42 -
https://www.acromag.com
section 3) since the interrupt release mechanism is Release on Register
Access (RORA) type. In addition, the IP module may need similar attention
(see your IP module documentation).
4.8 Power Failure Monitor
The carrier board contains a 5 volts undervoltage monitoring circuit which
provides a reset to the IP modules when the 5 volt power drops below 4.27
volts, typical / 4.15 volts minimum. This circuitry is implemented per the
Industrial I/O Pack specification.
4.9 Access LEDs and Pulse Stretcher Circuitry
An LED display and pulse stretcher circuit is dedicated to each IP module for
indication of a data transfer to/from the corresponding IP module. An IP
acknowledged data transfer activates the pulse stretcher circuit. The pulse
stretcher’s circuit is programmed to illuminate the LED for a duration of
0.125 seconds, typical.
4.10 Power Supply Filters
Power line filters are dedicated to each IP module for filtering of the +5, +12,
and -12 volt supplies. The power line filters are a T type filter circuit
comprising ferrite bead inductors and a feed-thru capacitor. The filters
provide improved noise performance as is required on precision analog IP
modules. Specifically, the filters are typically capable of over 40dB of
insertion loss for undesirable noise and oscillations in the 100MHz frequency
range and over 20dB of insertion loss for noise and oscillations in the 10MHz
frequency range.
4.11 Power Supply Fuses
Power line fuses are dedicated to each IP module for fusing of the +5, +12,
and -12 volt supplies. The +5 volt supply uses a 2 Amp fuse and the +/- 12
volt supplies use a 1 Amp fuse. These fuses are needed to protect the
power supply in the VME64x bus cage system.