Siemens SIMATIC S7-300 FM 350-1 Manual page 152

Operating Modes, parameters and commands
7.4 Measuring modes
Gate control in isochronous mode
SW gate control: You control operations using the SW gate by setting and resetting the
SW_GATE control bit in the user program. The measurement starts when the control bit is
set, and stops at the time T
Figure 7-38
HW gate control: You control a measurement using the HW gate by opening the HW gate to
start the operation, and immediately stop the measurement at the time T
gate:
Figure 7-39
152
in the next PROFIBUS DP cycle when the control bit is reset:
i
Starting and stopping a measurement using the SW gate (SW_GATE)
Starting and stopping measurements using the HW gate (HW_GATE)
by closing the HW
i
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01