ET 200
Distributed I/O systems of the ET 200 family enable the connection of distributed I/O devices to
a CPU or an adequate device.
The connection is made with interface modules for PROFINET IO or PROFIBUS DP.
Firmware update
Upgrading the rmware for modules (interface modules, electronic modules etc..), e.g. after
function extensions, to the most recent rmware version (update).
Flutter monitoring
Flutter monitoring is a process control function for digital input signals. Flutter monitoring
detects and reports unusual signal proles.
FREEZE
FREEZE is a control command of the DP master to a group of DP devices. FREEZE is only available
for PROFIBUS.
After receiving the FREEZE control command, the DP device freezes the current state of the
inputs and transfers these cyclically to the DP master.
The DP device freezes the state of the inputs after each new FREEZE control command.
The input data is transmitted cyclically again from the DP device to the DP master after the DP
master sends the UNFREEZE control command.
Ground
The electrical potential of conductive ground can be pulled down to zero at any point. In the
vicinity of ground connections, ground may assume a potential other than zero. For this reason,
the term ”reference ground” is often used.
Chassis ground includes all the interconnected inactive parts of equipment that must not carry
a hazardous voltage even in the event of a fault.
Ground
The electrical potential of conductive ground can be pulled down to zero at any point. In the
vicinity of ground connections, ground may assume a potential other than zero. For this reason,
the term ”reference ground” is often used.
Chassis ground includes all the interconnected inactive parts of equipment that must not carry
a hazardous voltage even in the event of a fault.
Grounding
Refers to connecting a conductive element to ground via a grounding system.
Glossary
ET 200iSP
466 Operating Instructions, 11/2022, A5E00247483-AK
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