α
2
Simple Application Controllers
Function Blocks 6
6 - 75
6.31 Delayed Alternate Block
The function block is used to generate a delayed alternate pulse to the output pin of the
function block.
Table 6.31: Delayed Alternate Function Block
Note: The delay time cannot be less than one scan time for the controller; otherwise, the
Delayed Alternate Function Block will not perform its assigned task for the time specified.
Users can monitor the scan time from the
α2
Series Controller. Scan time is dependent on the
user-program; therefore, caution is needed as and when time units are selected.
1 ) Delayed Alternate Operation
2 ) Delayed Alternate sample program
3 ) Delayed Alternate comparison sample program
Function
Set Item
Description
I
Input pin for delayed alternate function block
C
Clear pin for delayed alternate function block
FB
1) Time units: 10ms, 100ms or 1s (*Note)
2) Delay Time range: 0 to 32767
Output
The following items are available for another function block:
1) Word Output
a) Delay set value
b) Current value of delay time
2) Bit output
a) The delay action occurs after the function block sees the rising
edge of the input signal.
b) After the specified Delay time, the Output signal changes state
c) When the Clear Input signal sets ON, the Current Delay Time is
cleared and the Output signal will reset OFF.
0 0
0
A
D
O
I
L
C
P
Input pin
Clear pin
OFF ON
Output pin
Delayed
Time
Reset delayed timer
(shorter than set time)
Delayed
Time
Delayed
Time
Reset delayed timer
(shorter than set time)
Reset
Output pin
OFF
I01
I02
DAL
O02
I
CL
• Delay Time: 1s
I01
I02
DL
O02
I
CL
• ON Delay Time:
1s (10
×
100ms)
• OFF Delay Time:
0s (0
×
100ms)
AL
I
CL
