Configuring Hardware and Communication Connections STEP 7.pdf

Basics of Configuring Hardware with STEP 7
1.5.2 Exchanging Racks, C7 Devices, and DP Slaves
As of STEP 7 V5.1, Service Pack 1, if you have configured a station and assigned
addresses and parameters to the modules in a SIMATIC 400 rack, a C7 control
system, or a DP slave, you can exchange the rack if you maintain the module
arrangement and settings. In this case, a C7 control system and a DP slave are
considered racks.
Exchanging racks is not relevant for the SIMATIC 300 systems with only one rack
type (standard rail).
When Does It Make Sense to Exchange A Rack?
It is always necessary to exchange the rack of a SIMATIC 400 station if
functionality can only be expanded with the help of a different rack.
• Replacement of a power supply that does not have redundant capability with a
power supply that does have redundant capability, but is not supported by the
old rack.
• Replacement of a "short" rack (9 slots) with a "long" rack (18 slots) in order to
insert additional modules.
For racks that are configured as expansion racks (UR or ER with Receive-IM),
the Receive-IM is automatically placed in the last slot.
• A station that was configured originally with a long rack must be configured on a
short rack for reasons of space.
However, this exchange will not be permitted for long racks that are configured
as expansion racks (UR or ER with Receive-IM).
Procedure
Exchange of a C7 control system is always necessary in the following cases:
• The old C7 control system is to be replaced by a new one (order number with
higher function status, newer firmware version)
• The functionality of the old C7 control system is to be expanded (new C7 control
system with more integrated modules).
If you want to exchange a rack that has been fitted with modules, a C7 control
system, or a DP slave in a station configuration, proceed as follows:
1. In the station configuration, select the components (for example, a rack), that
you want to exchange.
2. In the Hardware Catalog window, select a component that is compatible with
the selected component (see below), but that has a different order number.
You cannot exchange identical components.
For DP slaves, the slave interface module (for example, the IM 153-2) is
selected from the Hardware Catalog window for the exchange.
3. Double-click on the component you want in the Hardware Catalog.
If the component is compatible, the exchange is made and the modules of the
originally configured component are adopted with their addresses and
parameters (to the extent possible).
An exchange is also possible if you use a drag-and-drop operation to move the
component from the Hardware Catalog window to the component to be exchanged.
Configuring Hardware and Communication Connections with STEP 7
1-14 A5E00706939-01