3 - 4 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
Rack with AMC8 / IOC8T card pairs
GENERAL SYSTEM DESCRIPTION
3.3 Rack with AMC8 / IOC8T card pairs
Figure 3-2 shows a block diagram of a networked rack featuring AMC8 / IOC8T card pairs. It
shows the interaction between these two cards as well as between them and other cards in
the rack.
The signals coming from measurement transducers and devices (such as RTD
thermometers, flow meters and proximity transducers) are connected to the IOC8T via the
inputs CH1 to CH8, which are accessible at the rear of the ABE04x rack.
The raw signals are processed by the AMC8 card using both analog signal processing and
digital signal processing. This card handles the management of signals, alarm levels, signal
processing and so on. The user is able to modify parameters concerning these operations by
using one of the VM600 MPS software packages (MPS1 or MPS2), from Meggitt Sensing
Systems’ Vibro-Meter product line.
Four alarm levels can be set for each channel, typically called Alert (A), Alert+ (A+),
Danger (D) and Danger+ (D+). These alarms – or combinations of them – can be used to
drive alarm outputs (relay outputs) on the IOC8T card. The OC Bus or Raw Bus can be used
to drive relays on an optional RLC16 card.
A DC output is available on the IOC8T card for each of the eight measurement channels.
These outputs (DC OUT 1 to DC OUT 8) can be calibrated by software and configured to
provide a current-based signal (4 to 20 mA) or voltage-based signal (0 to 10 V). The choice
between current and voltage is made by setting solder bridges on the IOC8T card. This
operation is normally done in the factory before delivery. The default setting provides a
current-based output.
Two discrete signal interface (DSI) control inputs are available on the IOC8T card:
• Danger Bypass (DB) – To inhibit relay outputs associated with the Danger levels (D
and D+).
• Alarm Reset (AR) – To reset (clear) latched alarms.
The VM600 MPS software packages and Modbus can be used to send channel inhibit
commands to individual AMC8 channels in order to temporarily bypass a sensor, that is, to
temporarily inhibit the protection offered by any associated relays.
The CPUM card acts as a “rack controller”. It communicates with the AMC8 / IOC8T card
pairs over the VME bus. The CPUM, and therefore the rack, can communicate with the
outside world over RS-232 and Ethernet links. The CPUM can operate on its own in the rack,
but it is generally used with the associated IOCN card. Depending on the options installed,
the IOCN allows communication with a host computer or computer network over one or
several RS-232, RS-422, RS-485 or Ethernet links.
See 5 AMC8 / IOC8T card pair for more detailed information on the AMC8 / IOC8T card pair.
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