12-6
TP27, TP37 Equipment Manual
Release 01/00
12.2 Electrical Installation
The Touch Panel requires electrical connections
S to the power supply,
S to the configuration computer (PU or PC),
S to the PLC.
The electrical connection to the PU or PC is required purely for downloading
the firmware and configuration. Following the configuration and test phases, a
serial printer can be connected to the Touch Panel instead of the configuration
computer.
A precondition for error–free operation is an EMC compatible hardware design
of the PLC and the use of interference–proof cables. The guidelines on
interference–free design of the PLCs apply equally to installation of the Touch
Panel.
!
Caution
S Only shielded cables are allowed for all signal connections.
S Screw or lock all plug connections.
S Do not install signal lines in the same cable ducts as power cables.
S Siemens AG refuses to accept liability for malfunctions and damage aris-
ing from use of self–made cables or cables from other manufacturers.
The operating units have reverse battery protection. This has no effect if a
connection already exists to another unit via RS 232. Therefore, proceed as
follows when commissioning the operating unit:
1. Connect the power supply.
2. Switch on the operating unit. If the operating unit does not power up, swap
the connections because the poles are reversed.
3. When the operating unit has been powered up, connect the configuration
computer or periphery equipment.
Electrical
connections
EMC compatible
design
Reverse battery
protection
Installation
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