Installation
4.4 Wiring guidelines
S7-1200 Programmable controller
76 System Manual, V4.2, 09/2016, A5E02486680-AK
Proper grounding and wiring of all electrical equipment is important to help ensure the
optimum operation of your system and to provide additional electrical noise protection for
your application and the S7-1200. Refer to the technical specifications (Page 1359) for the
S7-1200 wiring diagrams.
Before you ground or install wiring to any electrical device, ensure that the power to that
equipment has been turned off. Also, ensure that the power to any related equipment has
been turned off.
Ensure that you follow all applicable electrical codes when wiring the S7-1200 and related
equipment. Install and operate all equipment according to all applicable national and local
standards. Contact your local authorities to determine which codes and standards apply to
your specific case.
Installation or wiring the S7-1200 or related equipment with power applied could cause
electric shock or unexpected operation of equipment.
Failure to disable all power to the S7-1200 and related equipment during installation or
removal procedures could result in death, severe personal injury, and/or damage due to
electric shock or unexpected equipment operation.
Always follow appropriate safety precautions and ensure that power to the S7-1200 is
disabled before attempting to install or remove the S7-1200 or related equipment.
Always take safety into consideration as you design the grounding and wiring of your S7-
1200 system. Electronic control devices, such as the S7-1200, can fail and can cause
unexpected operation of the equipment that is being controlled or monitored. For this reason,
you should implement safeguards that are independent of the S7-1200 to protect against
possible personal injury or equipment damage.
Control devices can fail in an unsafe condition, resulting in unexpected operation of
controlled equipment.
Such unexpected operations could result in death, severe personal injury and/or property
damage.
Use an emergency stop function, electromechanical overrides, or other redundant
safeguards that are independent of the S7-1200.
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