II - DCE FEL ČVUT v Praze

Wiring diagram
SM 321
DI 4 x NAMUR
Input 0
Input 1
Input 2
Input 3
X 2
3 4
321-7RD00-0AB0
SF
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
F0
0
F1
1
F2
2
F3
3
Fig. 2-1 shows the terminal diagram of the digital input module SM 321;
DI 4 x NAMUR.The block diagram and detailed technical data can be found
on the following pages.
Channel number
1
2
3 8.2 V
4
18
1K
19
20
L
5
1K
6
7 8.2 V
8
9
1K
10
11
12 8.2 V
13
14
1K
15
16 8.2 V
17
M
Terminal diagram for
NAMUR sensor with
monitoring for
– wire break
– short-circuit
SF group fault [red] KF (0...3) channel-specific fault indication [red]
0...3 status indication [green]
1
2
3 8.2 V
4 10k
5
1k
9
1K
10
L
1K
6
7 8.2 V
8 10k
11
12 8.2 V
13
14
1K
15
16
17
18
1K
19
20 M
Fig. 2-1 Wiring diagram of digital input module SM 321; DI 4 x NAMUR
Notes on
intrinsically-safe
installation
Power supply for a
intrinsically-safe
structure
SIMATIC S7 Ex Digital Modules
Terminal diagram for
contacts
(connection
variants)
Contact with monitoring
for
– wire break
– conductor short-circuit
(only if resistors
connected directly at
contact)
Contact with monitoring
for
– wire break
(only if resistor
connected directly at
contact)
Contact
without monitoring
You must connect the DM 370 dummy module between the CPU or IM 153-2
(distributed configuration) and the Ex I/O modules whose signal cables lead into
the hazardous area. In a distributed configuration with an active backplane bus,
you should use the explosion-proof partition instead of the dummy module.
Additional information on system design can be found in Section 1.3 - 1.5.
In order to maintain the dearances and creepage distances, L+ / M must be
routed via the line chamber LK393 when operating modules with signal
cables that lead to the hazardous location, see Section 1.2.
2-3