Ct_Fb Down Counter - Panasonic FP Series Programming Manual

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Counter instructions

Counters realized with the CT_FB function block are down counters. The count area SV (set value)

is 1 to 32767.

For the CT_FB function block declare the following:

Availability of CT_FB (see page 1319)

Down Counter

count contact

each time a rising edge is detected at Count, the value 1 is subtracted from the elapsed value EV

until the value 0 is reached

reset contact

each time a rising edge is detected at Reset, the value 0 is assigned to EV and the signal output C

is reset; each time a falling edge is detected at Reset, the value at SV is assigned to EV

value of EV after a reset procedure

signal output

is set when EV becomes 0

elapsed value

current counter value

count contact (down)

reset contact

set when EV = 0

elapsed value