IDEC SmartRelay functions
208 IDEC SmartRelay Manual
4.4.25 Shift register
Short description
You can use the shift register function to read the value of an
input an
d to shift its bits left or right. The output value
corresponds with the configured shift register bit. The
shifting direction can be changed at a special input.
Functional description
The function reads the value at input In with a positive edge
(0 to 1 transit
ion) at input Trg (Trigger).
This value is applied to shift regist
er bit S1 or S8, depending
on the shifting direction:
• Shift up: The value at input In is set at S1; the previous
value at S1
is shifted to S2; the previous value at S2 is
shifted to S3 etc.
• Shift down: The value at input In is set at S8
; the previous
value at S8 is shifted to S7; the previous value at S7 is
shifted to S6 etc.
Output Q returns the value of the configured shift register bit.
If retentivity is disabled, the shift function restarts at S1 or S8
a
fte
r a power failure. When enabled, retentivity always
applies to all shift register bits.
Note
The special function shift register can be used only once in the cir-
cuit program.
Symbol in IDEC
SmartRelay
Wiring Description
Input In Input read at the start of the function.
Input Trg A positive edge (0 to 1 transition) at
input Trg (Trigger) starts the special
function. 1 to 0 transitions are
irrelevant.
Input Dir The signal at input Dir determines the
shifting direction for the shift register
bits S1...S8:
Dir = 0: Shift up (S1 >> S8)
Dir = 1: Shift down (S8 >> S1)
Parameter Shift register bit that determines the
value at output Q.
Possible settings: S1 ... S8
Retentivity:
/ = No retentivity
R = The status is retentive.
Output Q The output value corresponds with the
configured shift register bit.
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