Siemens simatic hmi op27 Equipment Manual page 225

Glossary
Control panel Option for the OP27 with a maximum of one block and for the OP37 with a
interface maximum of two blocks of 16 digital inputs/outputs for high-speed key opera-
tion without communication-related delays. May be used under SIMATIC S7
and PROFIBUS-DP.
D
Departure of a The point in time at which a message is withdrawn by the PLC.
message
Direct key module
Option for the OP27 with a maximum of one block and for the OP37 with a
maximum of two blocks of 8 digital outputs for high-speed key operation wi-
thout communication-related delays.
Display function
Function causing the contents of the display to be modified – for example, Dis-
play Message Level, Display Alarm Buffer And Display Process Screen.
DOS mode An OP operating mode allowing MS-DOS and Windows applications to be
loaded and edited.
Download mode
Operating mode of the OP during which data are downloaded from the PU or
PC to the OP.
Duration of display The time between the arrival and departure of a message.
E
Event message
Draws attention to specific operating states on machines or systems connected
to the PLC.
F
Field Reserved area in configured and non-configurable text for the output and/or
input of values.
Flash memory
Programmable memory which can quickly be deleted and then re-written.
Forced printout
Printout of alarm messages or event messages which were deleted as a result of
a buffer overflow.
Glossary-2
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OP27, OP37 Equipment Manual
Release 05/99