Siemens simatic hmi op27 Equipment Manual page 122

Electrical Installation
Electrical
The OP requires electrical connections
connections
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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.
EMC compatible A precondition for error–free operation is an EMC compatible hardware design
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.
!
Reverse battery
The operating units have reverse battery protection. This has no effect if a con-
protection
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
3. When the operating unit has been powered up, connect the configuration
OP27, OP37 Equipment Manual
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to the power supply
to the configuration computer (PU or PC)
to the PLC.
Caution
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Only shielded cables are allowed for all signal connections.
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Screw or lock all plug connections.
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Do not install signal lines in the same cable ducts as power cables.
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Siemens AG refuses to accept liability for malfunctions and damage aris-
ing from use of self-made cables or cables from other manufacturers.
the connections because the poles are reversed.
computer or periphery equipment.
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