Omron NT15S, Руководство по эксплуатации

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Standard Mode
Section 4-6
Fig.10: Pulse diagram - external data release
DR Key Data Release key
EA-Bit Editing request bit in the Read coordination byte
ED-Bit External data release in the Write coordination byte
EZ-Bit Editing status bit in the Read coordination byte
DF-LED Status LED in the Data Release key
A flashing status LED in the Data Release key always indicates that no external
data release has been set. Editing is allowed if the PLC has set bit 0 to 1. In this
case, the status LED in the Data Release key will light up. A blinking cursor will
appear in the first entry field in the mask. The Editor specified by the user will be
activated, depending on the selected variable.
External data release handling:
-
The PLC controls the external data release by switching the ED bit in the Write
coordination byte.
- If the Data Release key is pressed, the EA bit in the Read coordination byte will
be set and the status LED in the Data Release key will begin to flash.
- Approximately 100 ms later, the terminal will read the Write coordination byte
from the controller. Editing is allowed if the external data release has been set
(the ED bit in the Write coordination byte is set). In this case, the status LED in
the Data Release key will light up and the EZ bit in the Read coordination byte
will be set.
Editing is not allowed if the external data release has not been set (the ED bit in the
Write coordination byte is not set). In this case, the status LED in the Data Release
key will continue to flash.
-
During the editing process, the PLC can inhibit data entry at any time via the ED
bit. Whenever the operating terminal detects that the ED bit has been reset, data
input is inhibited, the status LED in the Data Release key begins to flash and the
EZ bit is also reset.
Whenever the operating terminal detects that the ED bit has been set, data input
is allowed, the status LED in the Data Release key lights up and the EZ bit is also
set.
- When the Data Release key is pressed again to exit the Editor, the last value that
was edited is confirmed (i.e. it is transferred to the controller); the EA bit and EZ
bit in the Read coordination byte are deleted.