Retentive Alternate Block - Mitsubishi Electric a2 Series Programming Manual

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2 Simple Application Controllers
6.23

Retentive Alternate Block

This block is equivalent to the Alternate Function block described in section 6.4 but includes a
the retention function. When the retention function is ON, the Retentive Alternation (RAL)
output will act as a latched output and remember the ON/OFF settings in the case of a power
failure. Every time the input pin receives a signal the ALT Output changes its ON/OFF status.
The Output alternates turning ON and OFF.
A Clear input signal over-rides the input signal and turns the Output OFF.
Table 6.31: Retentive Alternate Function Block
Function
0 0 0
I O
C
R A L
Retentive Alternation time chart
Run mode/
Stop mode
(Power OFF)
Input pin
Clear pin
Output pin
Set Item
I Input pin for retentive alternate function block
Clear input pin resets the state of the output regardless of the input
C
given
FB Retentive alternation of the output status
The output is affected in the following operation:
1) Reverse the ON/OFF state of the output whenever the input
signal's ON/OFF operation to the input pin is turned ON (ON to OFF
Output or OFF to ON)
2) The clear selection resets the output regardless of the input given.
3) Remember Output Signal after a Power Cut
Stop mode
(Power OFF)
Run mode
OFF ON
OFF ON
Description
Keep ON/OFF
state of Output pin
Function Blocks 6
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