Siemens SIMATIC S7-400 Hardware And Installation Manual page 216

Assembling the M7-400
Notes for Setting Up Monitors
Please observe the following notes when setting up monitors:
Ensure that the clearance between two monitors in asynchronous operation is
at least 15 cm, otherwise video interference may occur.
Exception: Monitors with a mu-metal shield.
Provide sufficient space between the monitor and extraneous magnetic
sources.
Do not set up the monitors in steel shelving or on steel benches. Magnetization
of the surrounding sheet steel can result in false colors or video shifting.
Avoid setting up monitors in the vicinity of transformers, radio transmitters,
magnets, and power cables.
The effects of extraneous magnetic fields can be attenuated by using a
mu-metal shield.
Special Conditions when Using Office Monitors
Additionally, you should observe the following notes when setting up office
monitors:
Office monitors with an internal metallized plastic housing should not be used in
an environment subject to electromagnetic interference, because the internal
metal surface cannot subsequently be connected to the external ground bus.
The required isolation of the electronic ground from the housing ground of the
monitors - essential for an environment subject to electromagnetic interference
- is not possible with most office monitors.
You can only use such monitors in conjunction with conventional VGA cables.
For this reason, only restricted connection to the M7-400 is possible, because
you can only cover short distances with these cables.
Connecting Printers
You can connect printers with a serial or parallel port.
A printer with a parallel port should be connected with the appropriate
connecting cable to the IF 962-LPT interface submodule.
A printer with a serial port should be connected with the appropriate connecting
cable to the IF 962-COM interface submodule.
We recommend you use a Siemens printer.
Note
Only a connecting cable with the shield grounded at both ends should be used
between an M7-400 component and a printer.
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S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01