Panasonic GTWIN Reference Manual page 46

GTWIN Reference Manual 1.6 GT Configuration
The table below explains the bit assignment of the control device.
When a bit is set, the status is true, i.e. the function is executed.
Memory clear
When bit 9 is set to 1, the memory for group no. 1 is full. Clear it by setting bit 1 of byte n+1
(R211 if WR20 is the control device selected) to 1.
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