K-138
Frequency/Rate Meter
K3NR
I BCD Output Timing Chart
A request signal from an external device (such as a Programmable Controller) is required to read BCD data.
Single Sampling Data Output
Approximately 30 ms after the REQ signal rises, a sample is taken and the DATA VALID signal is output. Read the data when the DATA VALID
signal is ON.
The DATA VALID signal will turn OFF in 40 ms, and then in 16 ms, the data will go OFF.
Models with a BCD output have an open collector output configuration so that wired-OR connection is possible.
Continuous Data Output
The K3NR outputs each measurement at an interval of 64 ms when a REQ signal is ON continuously.
If the HOLD signal is ON at the moment the DATA output is switched from Data 1 to Data 2 or vice versa, the output BCD data will be either Data
1 or Data 2 according to the timing of the HOLD signal. However, output data will never be below.
40 ms
16 ms
All data "high"
All data "high"
Data
Approx. 30 ms
DATA
REQ.
Max.
Min.
DATA
VALID
Pulse with a width of no less than 20 ms.
(no more than 50 ms.)
(1)
(2)
(3)
**
*
K3NR (1)
K3NR (2)
K3NR (3)
DATA
Programmable
controller
DATA (incl. POL and OVER)
and DATA VALID are wired-OR
processed.
The RUN, HH, H, PASS, L, and
LL signals are always output
regardless of the status of the
REQ signal. Do not OR-wire
these signals.
REQ.
(1)
REQ.
(1)
REQ.
(1)
DATA
VALID
*The period between the DATA VALID signal and the
REQ signal should be no less than 20 ms max.
40ms
40ms
64ms
64ms
24ms
24ms
All data "high"
DATA
Data 1
Data 2
REQ.
Max.
Min.
DATA
VALID
Approx.
30 ms
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