Hach si792 D series, User Manual

Page: 69 / 96

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 message
(default)
Logbook
(default)
Factory settings
defective
1 0000 11xx Failure ERR SYSTEM Yes
Configuration data
defective, Gaincheck 2
0000 11xx Failure ERR PARAMETERS Yes
7.1.2 Configuration menu (continued)