180
47DAC OPERATING MANUAL EM-9518-B Rev.4
• Timing Chart for Continuous Data Output
• Timing Chart for Single Sampling Cycle Data Output
30 ms
approx.
40 ms
64 ms
64 ms
24 ms
40 ms
24 ms
all data H
data
data
OFF
ON
OFF
ON
OFF
ON
REQ
MAX_REQ
MIN_REQ
DAV
DATA
*
1
30 ms
approx.
40 ms
16 ms
all data H
all data H
data
20 ms or wider (max. 50 ms)
OFF
ON
OFF
ON
OFF
ON
REQ
MAX_REQ
MIN_REQ
DAV
DATA
*
1
Measured data is output every 64 milliseconds while one
of the request signals (REQ, MAX_REQ or MIN_REQ)
remains ON.
Note) For the event trigger modes, the data value is the
same as the display.
When one of the request signals (REQ, MAX_REQ or
MIN_REQ) is given and its width is between 20 and 50
milliseconds, the DATA signal is established and the
DAV signal is given in approximately 30 milliseconds
from the falling edge of the request signal.
Note) Read in the data to a PLC at the timing of the
DAV signal. The DAV is turned OFF in 40 milliseconds.
The DATA signal is turned OFF in 16 milliseconds after
that.
• Output is provided via open collector, enabling wired-OR gate configuration
*
2
*
2
*
2
3
REQ 1
REQ 2
REQ 3
2
1
OFF
ON
OFF
ON
DAV
DATA
*
1
OFF
ON
OFF
ON
OFF
ON
PLC
REQ 1
REQ 2
REQ 3
47Dx
1
47Dx
2
47Dx
3
The wired-OR connection is available for the DATA, POL,
OVF, DAV, RUN, HH, H, P, L and LL signals when their
logic is negative.
*
1 DATA includes BCD Output, POL, OVF, HH, H, P, L, LL and RUN.
*
2 Wait for at least 20 ms between DAV turning off and the next REQ signal.
■
I/O LOGIC
The input/output logic is selectable for the following 4 parameters.
PARAMETER
SUB DISPLAY
MAIN DISPLAY
FUNCTION
DEFAULT VALUE
REQ input logic
Request valid at ON
Request valid at OFF
DAV output logic
Data valid at ON
Data valid at OFF
DATA output logic
Negative logic open collector
Positive logic open collector
Status output logic
*
1
Valid at ON
Valid at OFF
*
1 Output logic for RUN, POL, OVF, HH, H, P, L and LL
NOTE
• A change of the DAV output logic is effective after the next request signal ON.
• The HOLD and RESET signal logics are negative, not configurable.
• ON/OFF of the positive and negative logics is as shown in the right table.
Negative logic
(default)
OFF (Hi)
OFF (Hi)
ON (Lo)
Positive logic
ON (Hi)
OFF (Lo)
OFF (Lo)
