II - DCE FEL ČVUT v Praze

Wiring diagram
SM 3 32
AO 4 x 0/4...20 mA
Output 0
Output 1
Output 2
Output 3
X 2
3 4
332-5RD00-0AB0
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
x
SF
F0
F1
[EEx ib] IIC
F2
F3
Fig. 3-18 shows the terminal diagram of the analog output module SM 332;
AO 4 x 0/4...20 mA. You will find detailed technical specifications for the
analog output module on the following pages.
Logic and
backplane
bus
interfacing
SF
F (0..3)
Isolation
L +
M
L +
M
L +
M
L +
M
Isolation
390
D A
Digital/analog converter
D A
D A
D A
SF group fault indication [red]
F (0...3) channel-specific fault indication [red]
Fig. 3-18 Module view and block diagram of SM 332; AO 4 x 0/4...20 mA
Notes on
intrinsically-safe
installation
Power supply for a
intrinsically-safe
structure
L +
M
SIMATIC S7 Ex Analog Modules
L+
M
CH0
CH1
CH2
CH3
0...500
0...500
0...500
0...500 0...500
L +
QI 0
M 0-
QI 1
M 1-
QI 2
M 2-
QI 3
M 3-
M
CH0
CH1
CH2
CH3
You must connect the DM 370 dummy module between the CPU or IM 153-2
(in a distributed configuration) and the Ex I/O modules whose signal cables
lead into the hazardous location. In a distributed configuration with an active
backplane bus, you should use the ex dividing panel/ ex barrier instead of the
dummy module. Additional information on system design can be found in
Sections 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 I/O modules with signal
cables that lead to the hazardous location, see Section 1.2.
3-69