Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
5-5
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 such as flow rate detectors or power indicators providing a
quasi-static signal. This can be a current-based signal (typically 4to20mA, but an
extended range of 4 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 Ω 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, the IOC8T card’s DC outputs are configured to provide current-based signals with
a DC output signal range of 4 to 25 mA. Outputs are configured using the VM600 MPSx
software. For example, a 4 to 20 mA output corresponding to a 25 to 100°C (77 to 212°F)
input signal (processed value).
The actual value of a DC output can go outside the specified output signal range, depending
on the configured input signal and the load on the output.
For example, if a 25 to 100°C (77 to 212°F) signal actually goes from 25 to 105°C
(77 to 221°F), the output signal should remain linear outside of the specified DC output signal
range (up to the circuitry limits of approximately 4 to 25 mA for a load ≤440 Ω).
NOTE: Alternatively, the IOC8T card’s DC outputs can be factory configured to provide
voltage-based signals with a DC output signal range of 0 to 10 V but it is not
possible to have a mixture of current and voltage outputs. Contact Meggitt SA for
further information.
See also 10.4 Configuring the eight DC outputs.
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