Set/Reset Block - Mitsubishi AL2 Series Programming Manual

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Simple Application Controllers
6.4

Set/Reset Block

The function block will set or reset an output according to the input condition. When the SET
input is energised, the Output is ON. When the RESET input is energised, the Output is OFF.
When both inputs are energised simultaneously, the Output will follow the Priority Setting
signal. A latched Output does not depend on the constant signal to retain its status.
Set Priority - When the Set input comes ON, the Output comes ON and remains ON until the
Reset pin receives a signal. Once the Output is ON, the Set input signal can turn OFF without
effecting the Output. If both the Set and Reset pins are ON, the Output is ON.
Reset Priority - The operation is the same as the Set Priority except that when both pins are
ON, the Output is OFF.
Table 6.4: Set/Rest Function Block
Function
0 0 0
S P
R
S R
1 ) Operation of reset priority
Input pin S
Input pin R
Output
2 ) Operation of set priority
Input pin S
Input pin R
Output
Set Item
S Set pin for the function block
R Reset pin for the function block
Allocates priority to either the set or reset function when both pins are
FB
ON
O
The output of the function block operates in either an ON or OFF
state.
Output 1) Set the output ON until the reset pin is ON.
2) Decides the status of the output depending which input pin has
priority.
ON
OFF
ON
OFF
ON OFF
ON
OFF
ON
OFF
ON OFF
Description
Function Blocks 6
6 - 9