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3
Installing Modules
3.2
Installing the Base Module
Before installing the base module, be sure that power is
disconnected and turned off. Also ensure that the mode
switch, located behind the top access door shown in Fig-
ure 3.3, is set to "RUN."
STOP
RUN
TERM
Figure 3.3 Mode Switch
3.2.1
DIN Rail Mounting
The S7-I/O device and expansion modules attach to the DIN
rail by means of clips, which are supplied.
To mount an S7-I/O base module or expansion module to a
DIN rail, follow these steps:
1.
Open the DIN rail clip(s) on the bottom of the device by
pulling them downward. See Figure 3.4, which shows
the clip positions. (Base units have two clips; expansion
modules have one.)
2.
Seat the device on the DIN rail by positioning the
groove on the back of the device over the rail.
3.
Hold the device against the rail and push the clip(s) up
to attach the module. Be sure the device is firmly
seated on the rail. A slight tug on the bottom of the unit
will ensure proper seating of the unit.
To remove the module, pull the clip(s) down. A small hole is
provided, allowing use of a screwdriver to aid the removal.
Clip Open
Figure 3.4 DIN Rail Clips
8
Mode Switch in "RUN" Position
0
1
Clip Closed
3.2.2
Surface Mounting
To surface mount the S7-I/O device and expansion mod-
ules, 2 DIN M4 or American Standard #8 screws are
required per module. These screws are not provided. The
mounting holes are located behind the access covers at the
top and bottom edges of the front of the device. See Figure
3.5 for dimensions and locations.
0.25 in.
7.25 in.
(6.4mm)
(184.3 mm)
0.25 in.
(6.4mm)
Base
2.65 in.
Module
(67.3 mm)
Figure 3.5 Mounting Hole Locations
3.3
Attaching Expansion Modules
Base units and expansion modules all have a bus connector
on the right side for attachment of additional expansion
modules. The bus connector, included with the expansion
module, connects the modules. The bus connector is
shown in Figure 3.6. Before attaching an expansion mod-
ule, the bus connector panel must first be removed. To
remove the bus connector panel, follow these steps.
1.
Insert a flat-bladed screwdriver into the space between
the bus connector panel and the S7-I/O base module
or expansion module case. See Figure 3.7 for proper
placement of the screwdriver. The cover is not replace-
able.
2.
Gently pry off the bus connector panel, taking care not
to damage the case or other internal electronic compo-
nents.
Figure 3.6 Expansion module bus connector
Siemens Energy & Automation, Inc.
0.50 in.
3.04 in.
(12.8mm)
(77.3 mm)
Expansion
Module
Projections on Bottom
of Bus Connector
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