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Connecting Digital Input Connectors
Connecting Digital Input Connectors
Model
Digital input
connections
capability to monitor on/off-type digital signals, such as breaker or switch position
indicators. The functionality of the inputs can be configured on a channel basis to also
provide demand interval synchronization, pulse counting, KYZ metering or to provide
start/stop monitoring control. Each channel can be individually labeled, is triggerable,
and the polarity set as N/O or N/C.
Photo below shows the digital input module without the external connector.
A logical one or HI condition is when the voltage level goes above 3.5 volts and a
logical zero or LO condition is when the voltage level goes below 1.0 volts. Maximum
input signal level is 150Vac or 150Vdc. If the inputs are configured for AC instead of
DC signals, it is the rms value of the ac signal that is used to determine the state. This
will also slow the response time down, as the rms value is computed over 100msec
window for operation on 50 or 60Hz systems.
All logic transitions are to be time stamped to the millisecond and available for
simultaneous comparison by the user to data collected via other modules (V, I, other
Digital input, etc). An "event" can be either set to occur on the change of state (edge-
triggered) or at a particular state, HI/LO (level-triggered). Such events can be used to
cross-trigger other modules and/or instruments to also record data.
The Meter screens will report the present state of the inputs. Trends and Events
timeplots will indicate the signal level at the either 1 or 0 state at the time of data
storage, as will waveform data. There is no min/max/average value, just the
instantaneous value.
2-30
61MDIN is an eight channel, digital input module, providing users with the
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