II - DCE FEL ČVUT v Praze

1.3 Configuration of an S7-300 with Ex I/O Modules
Spacing for
arrangement on
several subracks
Mechanical Configuration of an Automation System with SIMATIC S7 Ex Modules
NON-EX (24V)
CABLE DUCT
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
Physical isolation of non-Ex signals from Ex signals corresponds to the
requirements with regard to the configuration of explosion-protected
automation technology.If the minimum distance of 50 mm between bare
(uninsulated) terminals of Ex modules and bare (uninsulated) terminals of
non-Ex modules can not be maintained, a spacer module DM 370 (order
number 6ES7 370-0AA00-0AA0) must be fitted between these modules.
Care must be taken to ensure that all automation systems are routed to a
common ground.
This means:
All earthing screws of the sectional rails must be referred to a common
ground.
The earthing clip of all CPUs must be locked in position.
Fig. 1-5 shows the spacing dimensions between the individual subracks as
well as to adjacent items of apparatus, cable ducts, cabinet panels etc. for a
two-tier S7-300 configuration.
40 mm
40 mm
40 mm
40 mm
IM 361
IM 360
Fig. 1-5 Spacing dimensions for a two-tier S7-300 configuration
L supply
a
EX
CABLE
DUCT
200 mm+ a
1-9