Siemens SIMATIC MV500 Operating Instructions Manual page 279

Electrostatic charging
Anyone who is not connected to the electrical potential of their surroundings can be
electrostatically charged.
The figure below shows the maximum electrostatic voltage which may build up on a person
coming into contact with the materials indicated. These values correspond to IEC 801-2
specifications.
Figure A-1
Basic protective measures against electrostatic discharge
• Make sure the grounding is good;
Make sure all persons, workplaces and packaging are sufficiently grounded when ESD
components are being handled. This prevents electrostatic charge.
• Avoid direct contact:
You should only touch ESD components if it is unavoidable (for example, during
maintenance work). Handle the modules without touching any chip pins or PCB traces. In
this way, the discharged energy can not affect the sensitive devices.
Discharge your body before you start taking any measurements on a module. Do so by
touching grounded metallic parts. Always use grounded measuring instruments.
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
Electrostatic voltages on an operator
A.2 Certificates, approvals & guidelines
Appendix
279