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Standard Mode
Section 4-10
Word-oriented assignment:
Word a 0
Bit 15 Bit 14 Bit 13 Bit 12 . . . . Bit 3
Bit 2
Bit 1
Bit 0
Word a 1
Bit 15 Bit 14 Bit 13 Bit 12 . . . . Bit 3
Bit 2
Bit 1
Bit 0
Word a 2
Bit 15 Bit 14 Bit 13 Bit 12 . . . . Bit 3
Bit 2
Bit 1
Bit 0
Word a 3
Bit 15 Bit 14 Bit 13 Bit 12 . . . . Bit 3
Bit 2
Bit 1
Bit 0
:
:
Word a n
Bit 15 Bit 14 Bit 13 Bit 12 . . . . Bit 3
Bit 2
Bit 1
Bit 0
Message 1 = Word 0, Bit 0
Message 2 = Word 0, Bit 1
Message 3 = Word 0, Bit 2
:
Message 16 = Word 0, Bit 15
Message 17 = Word 1, Bit 0
Message 18 = Word 1, Bit 1
The same rules apply to other data formats.
4.9.2.4.3
Time-Controlled Transfer of the Status Message
The transmission of parallel messages is activated either in a time-controlled mode
by the terminal or an event-controlled mode by the controller. The entire message
buffer is transmitted at once.
Both transmission methods can be implemented at the same time. This permits
longer polling intervals (every 5 to 10 s) to be defined. Critical or important mes-
sages can additionally be transferred on an event-controlled basis. The PLC is
automatically polled for the status messages after the polling time has elapsed.
The selected polling time should not be too short since the status message transfer
can take up a longer amount of time (depending on the number of messages and
the protocol).
No event-controlled transfer will take place if the polling time is set to 0,0 s.
4.9.2.4.4
Event-Controlled Transfer of the Status Message
The event-controlled transfer is activated by the controller by writing the event code
7FFF
H
to the serial message channel. This code causes the parallel message sys-
tem to be updated to ensure the messages in the operating terminal’s parallel
message buffer are current.
To be able to use the event-controlled transmission (also for polling times of 0,0 s),
the parameters file must contain the symbolic variable name and the length of the
status messages.
4.10
Help System
A screen-sized help text can be assigned to each mask and editable variable. If no
specific text is programmed, a default help text will be displayed instead. This de-
fault help text can be freely specified by the user through the programming system.
4.10.1 Default Help Text
If no help text has been defined for a particular mask, the default help text specified
in the programming system is displayed. This text is always present. If no text is
programmed, a blank mask is displayed instead.
Summary of Contents for NT15S
Page 1: ...Cat No V056 E1 1 Programmable Terminal NT4S NT15S NT18S OPERATION MANUAL ...
Page 2: ...ii ...
Page 3: ...iii NT4S NT15S NT18S Programmable Terminal Operation Manual Produced March 1999 ...
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Page 6: ...vi ...
Page 14: ...xiv ...
Page 26: ...12 The Terminals of the NT Series Section 1 2 1 2 4 1 2 NT4S SF122B E 1 2 4 1 3 NT4S SF123B E ...
Page 37: ...23 The Terminals of the NT Series Section 1 4 1 4 1 3 NT4S SF123B E 1 4 1 4 NT15S SF121B E ...
Page 54: ...40 The Terminals of the NT Series Section 1 7 1 7 6 3 ASCII Character Set Table ...
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