IDEC SmartRelay functions
IDEC SmartRelay Manual
95
Startup Marker
Marker M8 is set in the first cycle of the user program and
can thus be used in your circuit program as startup marker.
This signal is automatically reset after the circuit program
has completed its first cycle.
The M8 marker can be used in all further cycles for setting,
deletion and evaluation procedures in the same way as other
markers.
Note
The output of the marker always carries the signal of the previous
program cycle. This value does not change within the same pro-
gram cycle.
Shift register bits
IDEC SmartRelay provides the shift register bits S1 to S8,
which are assigned the read-only attribute in the circuit pro-
gram. The content of shift register bits can only be modified
by means of the “Shift register” special function (see Chapter
4.4.25).
Cursor keys
Up to four cursor keys are available to you, namely C
▲
, C
, C
▼
and C
(“C” = “Cursor”). Cursor keys are pro-
grammed for the circuit program in the same ways as other
inputs. You can set the cursor keys in the corresponding dis-
play while the system is in RUN (see Chapter 3.6.6), and in
an active message text (ESC + Key). Cursor keys can save
switches and inputs, and allow operator control of the circuit
program.
Levels
Voltage levels are designated
hi
and
lo
. A constant “1" = hi
or “0" = lo status at the block can be set by means of a per-
manent voltage level or constant value hi or lo.
Open connectors
Unused block connectors can be identified with an
x
.
▲
▲
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