Operating instructions

Safety instructions and approvals
2.4 Notes about Usage
MP 377 15" Touch daylight readable (WinCC flexible)
20 Operating Instructions (Compact), 04/2009, A5E02532357-01
WARNING
Personal injury and damage to property
Personal injury and property damage can occur in potentially explosive atmospheres if an
electric plug is disconnected from the HMI device while the system is in operation.
In potentially explosive atmospheres, always turn off power to the HMI device before
disconnecting any connectors.
Potentially explosive atmosphere zones 2 and 22
Areas subject to explosion hazard are divided into zones. The zones are differentiated
according to the probability of the existence of an explosive atmosphere.
Zone Degree of hazard Example
2 Explosive gaseous atmosphere occurs only
seldom and for a short period
Areas around flanged pipe joints
with flat gaskets in closed rooms
22 Area in which a potentially explosive
atmosphere in the form of a cloud in the air
containing flammable dust does not usually
occur or occurs only briefly during normal
operation .
–
Safe zone No
• Outside zone 2
• Outside zone 22
• Standard applications of
distributed I/Os