5 - 4 VM600 MPS hardware manual (standard version) MAMPS-HW/E
Edition 17 - February 2018
Overview of AMC8 / IOC8T operation
AMC8 / IOC8T CARD PAIR
5.2.1 Sensor signal conditioning
This block (see Figure 5-2) acts as a signal interface and is used to:
• Acquire a signal from the connected sensor.
• Check for signal overload (independently of the OK line check).
The AMC8 card does not have the ability to power external measuring devices. Where
necessary, an external power supply must be used.
See 5.3 Inputs and outputs.
5.2.2 Signal routing
This block (see Figure 5-2) is used only if cold-junction compensation (CJC) is required for
channels having a thermocouple connected.
The block enables a “cold junction” (CJ) temperature signal (generally obtained using an
RTD) to be routed to another channel on the card. One of two remote CJ signals can also be
selected. These come from other cards in the rack over Tacho Bus lines 7 and 8.
5.2.3 Signal processing and monitoring
This block (see Figure 5-2) assures the following:
1- Definition of “multi-channels”
Based on the eight single channels, four “multi-channels” can be defined. These can
group between two and eight single channels and perform various mathematical
operations on them, such as obtain the minimum, maximum or average value. The
difference between two individual channels can also be calculated.
See 5.4 Multi-channel processing functions.
2- Selection of the time-domain processing function
The functions include the following: direct output (bypass), average over a period of time,
maximum value over a period of time, minimum value over a period of time.
See 5.5 Time-domain processing functions.
3- Linearity compensation
Linear and non-linear sensor compensation can be applied for thermocouples and RTD
devices.
See 5.6 Linearity compensation.
4- Monitoring
For single channels and “multi-channels”, the signal values (suitably processed and
compensated) are monitored and alarms generated if the thresholds are exceeded.
These alarms can be used to set relays.
Logical combinations of alarms can also be configured.
See 5.7 Alarm monitoring.
5- Sensor OK Level Detection
This function monitors the OK levels for the sensor to check for hardware problems (for
example, faulty sensor or signal conditioner, or defective transmission line).
See 5.8 System self-checks.
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