3
Design and Function
Page 26 of 78
Operating Instructions
enCore FC1
3.6 Available Process Boards
The configuration of the I/O board mounting is variable. In principle, any I/O
board can be inserted into any slot. If there are any restrictions, they are
mentioned in the following paragraphs describing the individual boards.
Please refer to section 4.3 for a description of how the I/O board
configuration can be modified. Section 4.4 contains connection diagrams for
typical applications.
3.6.1 ExMFE5 Process Board
All ExMFE5 inputs are intrinsically safe ([EEx ib] IIC).
Three NAMUR inputs (Z1+/Z1-, Z2+/Z2-, Z3+/Z3-) for
messages, LF pulses or HF pulses. Pulse inputs are
typically used to connect gas meters that have a pulse
interface.
As an alternative, the first channel is suitable for
connecting a gas meter via an Encoder index.
A resistance input with 4-wire technology (I+/U+/U-/I-),
provided for connecting a Pt100 temperature sensor.
An analog current input 4…20mA (P+ / P-), alternatively
usable as a HART interface. Provided for connecting
measuring instruments that have a current output (e.g.
pressure transmitters) or HART interface (e.g. pressure
transmitters or temperature transmitters).
Two different modes are possible when using the current
input as a HART interface:
Fig. 3-4
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Multi-drop mode for a maximum of 4 HART devices
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Burst mode: 1 HART device
