7MF4232
Operating Instructions
17
C79000-B5676-C92-01
D
Connection with plug (not for protection type “flame-proof enclosure”)
The contact parts for the connector are enclosed packed in a bag.
- Push sleeve and gland onto the cable
- Strip off cable ends about 8 mm
- Crimp or solder contact parts to the cable ends
- Assemble the connector
6
5
4
7
1
2
3
--
+
I
A
U
H
I
A
output current
U
H
auxiliary power
Figure 2.3 Connection with plug
+
---
Power supply
Test sockets for DC meter
or connection possibility for external indicator (M5-screws)
Terminal strip
Terminals
PC/Laptop
RS-232-C
HART
R
-
Communicator
or
HART
R
-
Modem
230
Ω
to 500
Ω
(230
Ω
to 1100
Ω
for Hart
R
communicator)
Figure 2.4 Electrical connection, schematic diagram
For error-free communication at least one load of 230
Ω
must be available in the signal circuit
(see Figure 2.4). When using power supply isolators for Smart transmitters, e.g. Siemens 7NG4021, a
load is already installed in the isolator (see Figure 2.5, page 18). The isolator with intrinsically safe input
circuit (transmitter circuit) is at the same time a safe isolation between the intrinsically safe and the not
intrinsically safe circuit. The HART
R
-Modem or the HART
R
-Communicator can be connected to the jacks
marked with HK (see Figure 2.5).
!
Warning
.
The HART
R
-Modem may not be used in hazardous areas and must not be connected
to intrinsically safe circuits.
