MELSEC-A
7. EXECUTING THE PRESET FUNCTION
7- 3
7.3 Preset by External Control Signal
A voltage is applied to the external input PRESET terminal to execute preset.
1) ...... Write any value in advance in 24-bit binary to the preset value setting area
{addresses RWwm+0 to 1 (RWwm+8 to 9)}.
2) ...... When the preset command switches on (voltage is applied to the PRESET
terminal), the value in the preset value setting area is preset to the present
value storage area.
3) ...... Preset can be executed independently of whether the count enable command
{RY(n+1)4 (RY(n+1)B)} is on or off.
POINT
• For the preset function through external input, reset external preset detection
(5) in the figure above) every time after the execution of the preset function is
completed. Doing so allows the next external input.
• While the external preset command detection {RXn3 (RXn7)} is on (4) in the
figure above), the next execution of the preset function through external input
or a sequence program is not allowed.
• If the following time is not satisfied for the execution of the external preset
detection reset command , the external preset detection reset command will
not switch on-off.
Executed
*1
External preset detection
reset command
{RY(n+2)0(RY(n+2)2)}
*1..... 10 link scans+2 sequence scan
Executed
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