Appendix
A.2 System alarms
TP 270, OP 270, MP 270B (WinCC flexible)
Operating Instructions, Edition 03/2004, 6AV6691-1DD01-0AB0
A-3
ESDs should not be brought into contact with charge-susceptible and highly insulating
materials such as plastic films, insulating table tops and items of clothing containing
synthetic fibers.
Assemblies should be deposited only on conductive surfaces, e.g. tables with an ESD
coating, conductive ESD cellular material, ESD bags, ESD shipping containers.
Do not place ESDs near visual display units, monitors or television sets (minimum distance
to screen > 10 cm).
Never touch ESDs so that contact is made with module connections or conductor rails.
Measuring ESD assemblies
Perform measurements on ESD assemblies only when:
•
The measuring instrument is grounded (e.g. by means of a grounded conductor).
•
The measuring head has been briefly discharged before measurements are made with a
potential-free measuring instrument (e.g. by touching a bare metal control cabinet).
When soldering, use only grounded soldering irons.
Shipping ESD assemblies
Always store and ship assemblies and devices in conductive packing (e.g. metal-plated
plastic boxes, metal boxes).
•
Packing ESD
If packing is not conductive, ESDs must be conductively wrapped before they are packed.
You can use, for example, conductive foam rubber, ESD bags, domestic
!
e-establ foil or
paper (never use plastic bags or foils).
•
ESD with fitted battery
With assemblies containing fitted batteries, make sure that the conductive packing does
not come into contact with batteries or short-circuit them. If necessary, cover the
connectors beforehand with suitable insulating material.
A.2 System
alarms
Introduction
System alarms on the HMI device provide information on internal conditions of the HMI
device and PLC.
The following is an overview of when system alarms occur, their causes and the remedies
available.
Note
System alarms are only displayed when an alarm window has been configured, System
alarms are issued in the language currently set on the HMI device.
