4
Design and Function
enCore FC1
Operating Instructions
Page 35 of 97
The process board ExMFE5 is an “associated electrical
equipment” according to EN50020, which provides for five
intrinsic input safe circuits of the category [Ex ib Gb] II C:
•
Three NAMUR inputs (Z1+/Z1-, Z2+/Z2-, Z3+/Z3-) for
signals, LF pulses and HF pulses.
As an alternative, the first channel is suitable for
connecting an encoder index.
•
A resistance input in 4-wire technology (I+/U+/U-/I-).
•
An analog current input 4 … 20mA (P+/P-), alter-
natively usable as a HART interface.
Fig. 4-4
4.5.2 MFE7 Process Board
The process board MFE7 provides for seven intrinsic input
safe circuits:
•
A resistance input in 4-wire technology
(RI+/RU+/RU-/RI-).
•
Two analog current inputs (A1+/A1-, A2+/A2-) in
operational modes 0…20 mA or 4...20 mA, alter-
natively usable as a HART interface.
•
Three pulse inputs or signal inputs (D1, D2, D3/GND)
for signals, LF pulses or HF pulses. As an alter-
native, the third channel (D3/GND) is suitable for
connecting an encoder index. As an alternative,
channels 2 and 3 (D2, D3/GND) can be used as a
frequency input
•
A RS485 serial interface (RSA/RSB/GND).
Fig. 4-5