Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module - Manual (Page 25)

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011
Counter Modes 25
Store and Reset, Wait, and Start
In the Store and Reset, Wait, and Start mode, the module:
• reads the Present Value and places it into the Stored Value on the
leading edge of Input Z and resets the count to zero (0) in the Present
Value.
• resumes normal counting from zero (0) after the Z-Input goes low.
• retains the Stored Value until it is overwritten by new data from the next
leading edge of a pulse on Input Z.
Store and Reset, and Start
In the Store and Reset, and Start mode, the module:
• reads the Present Value and places it into the Stored Value on the
leading edge of Input Z and resets the count to zero (0) in Present
Value.
• resumes counting from zero (0) regardless of the state of the Z-input.
• retains the Stored Value until it is overwritten by new data from the next
leading edge of a pulse on Input Z.
Present Value Tag
in Logix Controller
Stored Value Tag
in Logix Controller
Z-Input
10 11 0 1 2 3 0 0 1 2
... 11 11 11 11 11 3 3 3 3 3
44902
Incoming Pulses
0 0 0
10 11 12 13 14 15 16 17 18 19 20
Present Value Tag
in Logix Controller
Stored Value Tag
in Logix Controller
Z-Input
10
...
11
11
0 1 2 3 4 0 5 1 2
5 11 11 11 11 5 5 5 5
44903
3 4
10 11 12 13 14 15 16 17 18 19 20 Incoming Pulses