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OP27, OP37 Equipment Manual
Release 05/99
Electrical Installation
The OP requires electrical connections
to the power supply
to the configuration computer (PU or PC)
to the PLC.
The electrical connection to the PU or PC is required purely for downloading
the firmware and the configuration. Following the configuration and test
phases, a serial printer can be connected to the OP 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 inter-
ference-free design of the PLCs apply equally to installation of the OP.
!
Caution
Only shielded cables are allowed for all signal connections.
Screw or lock all plug connections.
Do not install signal lines in the same cable ducts as power cables.
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 con-
nection already exists to another unit via RS 232. Therefore, proceed as fol-
lows 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
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