Hach-Lange SI792 D, SI792x D, SI792x D-FF, SI792x D-PA User Manual - Manual (Page 69)

Operation—Profibus PA
67
7.2 Profibus PA communication
Profibus PA uses a master/slave data exchange technique. The master
(typically a PLC) generates queries to individual slaves. The slaves, in
turn, reply back with a response to the master. A Profibus message
contains the information required to send a query or request, including
the slave address, function code, data, and a checksum. See
Table 20
on page 67 for Profibus communication parameters.
Enter the salinity
0–45.00 SAL (default: 00.00)
Enter polarization voltage
U-Pol
0 mV to 800 mV (default: 675 mV, 0mV = Off)
Select Sensocheck
CHECK ON Continuous Sensocheck
evaluation of sensor function
CHECK OFF (default)
Select the calibration mode
CAL
Saturation (Sat)
Concentration (Conc) (default)
Enter cal timer interval
0000–9999 h (default: 0000 h (Off))
Enter Profibus address
Edit
0001–0126 (default: 0126)
Table 20 PROFIBUS PA communication
Cause
No. of
binary
message
Analog input
status
Physical Block
(PB)
Global status
Text of binary m
(default)
Factory settings
defective
1 0000 11xx Failure ERR SYSTEM
Configuration data
defective, Gaincheck
2 0000 11xx Failure ERR PARAMET
7.1.2 Configuration menu (continued)