US 9,813,066 B2
PLC high speed counter and operating method thereof
Kang-Hee Park, Chungcheongnam-do (KR)
Assigned to LSIS CO., LTD., Gyeonggi-Do (KR)
Filed by LSIS CO., LTD, Gyeonggi-do (KR)
Filed on Oct. 30, 2015, as Appl. No. 14/927,987.
Claims priority of application No. 10-2014-0148900 (KR), filed on Oct. 30, 2014.
Prior Publication US 2016/0126958 A1, May 5, 2016
Int. Cl. H03K 21/38 (2006.01); H03K 21/02 (2006.01)
CPC H03K 21/026 (2013.01) [H03K 21/38 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An operating method of a programmable logic controller (PLC) high speed counter configured to count a pulse and transmit a generated count value to an external device, the method comprising:
counting, when the pulse is input, the pulse in a linear count manner and generating a count value;
storing the count value in a buffer as a current linear count value;
determining, when a current value request is input from the external device, a mode of the PLC high speed counter; and
transmitting, when the mode of the PLC high speed counter is determined to be a ring counter mode as a result of the determining, a current ring count value to the external device,
wherein the current ring count value is calculated by the following

OG Complex Work Unit Drawing
wherein RINGMAX denotes a maximum ring count value, RINGMIN denotes a minimum ring count value, and FLOOR( )denotes a FLOOR function.