VM600 MPS hardware manual (standard version) MAMPS-HW/E 5 - 5
Edition 17 - February 2018
Inputs and outputs
AMC8 / IOC8T CARD PAIR
5.3 Inputs and outputs
5.3.1 Measurement signal inputs
The following sensor types can be used with the AMC8 / IOC8T card pair:
• Thermocouples (type E, type J, type K, type T or user defined)
• RTD devices (Pt100, Cu10, Ni120 or user defined)
• Other measurement systems (for example, flow rate detectors or power indicators)
providing a quasi-static signal. This can be a current-based signal (typically 4 to 20 mA,
but an extended range of 0 to 25 mA can also be processed) or a voltage based signal
(0 to 10 V).
RTD devices can be connected in a 2-wire, 3-wire or 4-wire arrangement.
A 50 measuring resistor is used for systems providing a current-based signal. The input is
protected by a self-resetting 50 mA fuse.
For voltage-based signals, only unipolar signals can be processed. Negative signals can be
measured simply by reversing the polarity of the input wires.
Hardware associated with the sensors such as power supplies, signal conditioners, optional
safety barriers or galvanic separations are not implemented within the MPS rack, but
externally.
NOTE: See 10 Configuration of AMC8 / IOC8T cards for further information on connecting
sensors.
5.3.2 DC outputs
Eight DC outputs (DC OUT 1 to DC OUT 8) are available on the IOC8T card. These can
output fully-processed values from single channels or multi-channels.
By default, these outputs provide current-based signals. However, solder bridges can be
configured to provide voltage-based signals on all eight outputs (which must be set in the
factory). That is, the specified DC output signal range can be either 4 to 20 mA or 0 to 10 V.
NOTE: The solder bridges on the IOC8T card select either current or voltage for all
outputs. It is not possible to have a mixture of current-based and voltage-based
outputs.
Outputs are configured using the VM600 MPS software. For example, a 4 to 20 mA output
corresponding to a 25 to 100°C signal.
The actual value of a DC output can go outside the specified output signal range, depending
on the processed value (signal). For example, if the configured 25 to 100°C signal actually
goes from 20 to 105°C, the output signal should remain linear outside of the specified DC
output signal range (up to the circuitry limits of approximately 0 to 25 mA and 0 to 13 V).
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