IDEC SmartRelay functions
194
IDEC SmartRelay Manual
Functional description
The function reads the value at input In with a positive edge
(0 to 1 transition) at input Trg (Trigger).
This value is applied to shift register 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
after a power failure. When enabled, retentivity always ap-
plies to all shift register bits.
Note
The special function shift register can be used only once in the cir-
cuit program.
Timing diagram
Trg
In
Q
Dir
S1
1
0
1
1
0
1
S2
0
1
0
1
1
1
S3
0
0
1
0
1
0
S4
0
0
0
1
0
1
S5
0
0
0
0
1
0
S6
1
0
0
0
0
0
S7
1
1
0
0
0
0
S8
0
1
1
0
0
1
0
0
0
0
1
1
0
0
Shift up
Shift down
S4 = Q
(example)
Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: (800) 670-4183 ● www.stevenengineering.com
