Rockwell Automation 1760-xxxx Pico GFX-70 Controllers User Manual - Manual (Page 188)

Publication 1760-UM002B-EN-P - March 2005
4-78 Wiring with Pico GFX-70
Function of the Frequency Counter Function Block
Figure 4.32 Signal diagram of frequency counter
1: counter input I1 to I4
2: upper set point value >SH
3: lower set point value >SL
4: enable CF..EN
5: contact (make contact) CF..OF upper set point value exceeded
6: contact (make contact) CF..FB lower set point value undershot
7: actual value equal to zero CF..ZE
t
g
: gate time for the frequency measurement
1
2
3
4
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g t
g
t
g
t
g
t
g
t
g
t
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t
g
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