The data logger includes terminals that are configurable for pulse input as shown in the
following image.
Table 6-2: Pulse input terminals and the input types they can measure
Input Type Pulse Input Terminal
High-frequency
C (all)
U (all)
Low-level AC
U (even numbered terminals)
Switch-closure
P1
P2
C (all)
U (all)
Using the PulseCount() instruction, U and C terminals are configurable for pulse input to
measure counts or frequency. Maximum input frequency is dependent on input voltage. If pulse
input voltages exceed the maximum voltage, third-party external-signal conditioners should be
employed. Do not measure voltages greater than 20 V.
NOTE:
Conflicts can occur when a control port pair is used for different instructions (TimerInput
(), PulseCount(), SDI12Recorder(), WaitDigTrig()). For example, if C1 is used
for SDI12Recorder(), C2 cannot be used for TimerInput(), PulseCount(), or
WaitDigTrig().
6. Measurements 79
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