Siemens SIMATIC S5-100U System Manual page 520

Active and Passive Faults in Automation Equipment
Additional precautions for modules without housings
Note the following measures that have to be taken for modules that are not protected against
accidental contact:
• Touch electrostatical sensitive devices only
- if you wear a wristband complying with ESD specifications or
- if you use special ESD footwear or ground straps when walking ona an ESD floor.
• Persons working on electronic devices should first discharge their bodies by touching grounded
metallic parts (e.g. bare metal parts of switchgear cabinets, water pipes, etc.)
• Protect the modules against contact with chargeable and highly insulating materials, such as
plastic foils, insulating table tops or clothes made of plastic fibres.
• Place electrostatic sensitive devices only on conductive surfaces:
- Tables with ESD surfaces
- Conductive ESD foam plastic (ESD foam plastic ismostly coloured black)
- ESD bags
• Avoid direct contact of eletrostatic sensitive devices with visual display units, monitors or TV
sets (minimum distance to screen > 10 cm).
C-4
S5-100U
EWA 4NEB 812 6120-02b