Endress+Hauser RMA 422 - 3 Electrical Connection; Terminal Layout

Terminal layout In- and output
L/L+ L for AC L+ for DC
Power supply
N/L- N for AC L- for DC
101
- Signal ground transmitter 1
+ Current signal 0/4...20 mA
Analogue input 1
102 - Current signal 0/4...20 mA
103 + Power supply transmitter 1
201
- Signal ground transmitter 2
+ Current signal 0/4...20 mA
Analogue input 2
(optional)
202 - Current signal 0/4...20 mA
203 + Power supply transmitter 2
41 Normally closed
Relay output 1
(optional)
42
Common
(same connection as relay 1)
43 Normally open
51 Normally closed
Relay output 2
(optional)
52
Common
(same connection as relay 2)
53 Normally open
131 Output + current, voltage
Analogue output 1
(optional)
132 Output - current, voltage
231 Output + current, voltage
Analogue output 2
(optional)
232 Output - current, voltage
HART

1
HART

- communication to
SMART-transmitter 1
Communication
sockets
HART

2
HART

- communication to
SMART-transmitter 2
Communication
sockets (optional)
RS 232
Connections for setting up and measured value
readout (PC - setting up software)
Serial interface
131
101
201
102
202
103
203
132
231
232
L/L+ N/L-
43 42 41
53 52 51
3. Electrical connection
3.1 Terminal layout
Connection HART
®
1
Connection RS 232
(stereo plug 3,5 mm)
Connection HART
®
2
(banana plug 2 mm)
Process transmitter
42