Endress+Hauser RMA 421 - Electrical Connection; HART Connection

Terminal layout In and outputs
L/L+ L for AC L+ for DC
Power supply
N/L- N for AC L- for DC
81 + 24 V loop power
Loop power supply
82 0 V loop power
83
+ 24 V loop power with integrated HART
®
communication resistor (250 Ohm)
11*
Signal ground Current, voltage, thermocouple,
RTD (2-wire)
Power cable - RTD (3-/4-wire)
Measurement signal
input
12 Signal - RTD (3-/4-wire)
13
Signal Voltage +/-100mV, thermoouple,
Pt100, Ni100
14 Power cable + RTD (2-/3-/4-wire)
15
Signal Voltage +/-10V, 0...1/10V,
Pt500, Pt1000, 0...4000 Ohm
16 Signal Current +/-20mA, 0/4...20mA
41 Normally closed
Relay output 1
(optional)
42 Common
43 Normally open
51 Normally closed
Relay output 2
(optional)
52 Common
53 Normally open
31 Output + Current, voltage Analogue output
32 Output − Current, voltage (optional)
HART

HART

- communication to
SMART transmitter
Communication
sockets
RS 232 Connection for setting up (software) Serial interface
*Terminal 11 twice available
HART
®
connection
RS 232 connection
3. Electrical connection
3.1 Terminal layout
Process transmitter
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