Page 52 of 82
Date: 27.01.06
8.2.1.2
Bit coding details
PLCin: Data bytes from 9221 to master
Byte 1:
MSB
LSB
X
TARE
active
Sensor test
result
valid
Sensor test
result
Evaluation
valid
Evaluation
NOK too
high
Evaluation
OK
Evaluation
NOK too
low
Byte 2:
MSB
LSB
X
X
X
X
Meas.
toggle
count
MSB
Meas.
toggle
count
bit 2
Meas.
toggle
count
bit 1
Meas.
toggle
count
LSB
Byte 3: (Mirror of 1st control byte)
MSB
LSB
X
Handshake
Reset
Max value
buffer
Handshake
Reset
Min value
buffer
Handshake
Reset
Evaluation
Handshake
Reset
Mean
value
Handshake
Reset
TARE
Handshake
Perform
TARE
Freeze
evaluation
status
Byte 4: (Mirror of 2nd control byte)
MSB
LSB
State
Shunt
C
State
Shunt
B
State
Shunt
A
Handshake
adopt
upper limit/
lower limit
Handshake
Save
s
etup in
EEPROM
State
Test
method
ALT/DC
B
State
Test
method
ALT/DC
A
Handshake
Perform
sensor test
NOTES
•
Evaluation results
•
This is where the actual evaluation results are shown. One needs to be
aware of the evaluation type.
•
The "Evaluation valid" signal indicates whether or not the result can be
trusted. For instance, if the amplifier is over-driven or the evaluation
was prevented, this bit is 0.
•
Sensor test
•
The validity flag is cleared when a new sensor test is started (see
below). As soon as a result from the sensor test is available, the result
flag and validity flag are set accordingly.
•
Tare
•
The TARE active flag indicates that a tare value != 0 is currently
included in the result.
