20
MRBP.424321.001UM Version 1.0 27/01/2020
Appendix A
Pin assignment
Pin assignment is shown in table A.1 and figure A1.
Table A.1
Pin
№
of
the
contact
Circuit name
Purpose
X
1…
X8
1
+ Power sup-
ply
power supply output to the sensor positive contact (24 V). Con-
nected to the
«
+
»
of pin power supply X9 via reverse polarity
protection circuit and overcurrent protection circuit (max
1,25
А
per channel over the entire supply voltage range)
2
+ Signal
current loop positive contact 4-20
мА
(to the sensor)
3
- Signal
Current loop negative contact 4-20
мА
(to the sensor)
4
- Power supply
Power supply output to the sensor negative contact (0 V). Con-
nected to the
«
- power supply
»
pin X9.
X9
1
+ Power sup-
ply
Supply voltage input positive contact (recommended device
supply voltage 24 V, and permissible
–
12-32 VDC)
2
- Power supply supply voltage input negative contact (0 V)
X10
1
RS485-A
noninverting driver output/receiver input
(to the control unit)
2
RS485-GND
common trunk (0 V). Galvanically isolated from pin power sup-
ply negative contact X9 (1500 V,1 minute)
(to the control unit)
3
RS485-B
inverting driver output/receiver input
(to the control unit)
X11
1
RS485-A
noninverting driver output/receiver input
(to the sensors)
2
RS485-GND
common trunk (0 V). Galvanically isolated from pin power sup-
ply negative contact X9 (1500 V,1 minute)
(to the sensors)
3
RS485-B
inverting driver output/receiver input
(to the sensors)
X12
1
NO Threshold
1
normally open threshold relay contact 1
2
Common
Threshold 1
threshold relay common contact 1
3
NC Threshold
1
normally closed threshold relay contact 1
X13
1
NO Threshold
2
normally open threshold relay contact 2
2
Common
Threshold 2
threshold relay common contact 2
3
NC Threshold
2
normally closed threshold relay contact 2
X14
1
NO Failure
normally open failure relay contact