KEYENCE DL-PD1 - Manual (Page 47)

3-5 Overview of PROFIBUS DP Communication
3-25 - PROFIBUS DP Compatible Network Unit DL-PD1 User's Manual (GT-70A) -
Execu
ting Communi
cat
ion
3
Reading comparator values (P.V. values) from sensor amplifiers
Comparator values (P.V. values) can be read only in the monitor mode. They cannot be
read in the I/O mode.
"Operation mode of DL-PD1" (page 3-6)
 Example of reading the comparator value (P.V. value) from the sensor
amplifier
This example shows how to read the comparator values (P.V. values) from the sensor
amplifiers ID01, ID02, and ID03.
(1) When the comparator value of a sensor amplifier is updated, the value of the input
octet is also updated via cyclic communication.
If the comparator value is correct, the parameter range is -199.999 to +199.999.
If the comparator value is over range, under range, or invalid, the previous value is
retained without updating the comparator value. To confirm whether the current
value is correct, use the comparator value property.
(2) The comparator value invalid, comparator value over range, or comparator value
under range is entered.
If the comparator value of a sensor amplifier is "invalid", "over", or "under", the bit
corresponding to the ID number of that sensor amplifier flips to 1.
(1)
Master
Comparator value under range
Input octet 3/10/17 Bit 3 of Slot 1/2/3
Comparator value of ID 01 1234 4567 6789
Input octet 5 to 8 (DEX) of Slot 1
Comparator value of ID 02 2345 5678 7890
Input octet 12 to 15 (DEX) of Slot 2
Comparator value of ID 03 3456 8901
Input octet 19 to 22 (DEX) of Slot 3
Sensor amplifier
Comparator value of ID 01 1234 4567 6789
Comparator value of ID 02 2345 5678 7890
Comparator value of ID 03 3456 8901
Comparator value over range
Input octet 3/10/17 Bit 2 of Slot 1/2/3
Comparator value invalid
Input octet 3/10/17 Bit 1 of Slot 1/2/3
1
1
1
0
0
0
(2)
(2)
(2)