Diagnosis - Siemens SITRANS P DS III Operating Instructions Manual

Configuration/project engineering
9.2 Configuring
The status code consists of one letter and a three-digit number. The letter stands for:
G
U
B
Table 9- 4 Example status code
Digital Hex Configured measured
display value source
G_141 8D Electronics tempera-
ture, output
U_071 47 Output
B_011 0B Secondary variable 3
See also
Overview of status codes (Page 189)
9.2.5

Diagnosis

Besides status information, the device can also actively send information about its own state.
Diagnostics are important information which an automation system can use to initiate
corrective measures.
To transmit diagnostic information, the standard mechanisms of the PROFIBUS DP are used
and messages are actively sent to the class 1 master. PROFIBUS DP provides a protocol to
transmit information to the class 1 master with a higher priority than the user data.
Messages
The content of the "Device state" parameter from the physical block is sent, along with
information about whether a state change (event incoming/event sent) has occurred.
The diagnostic object consists of four bytes. For the pressure transmitter, only the first two
bytes are relevant.
Table 9- 5
Byte
Byte 0
168
Good
Unsure
Bad
PDM display
Good,
lower alarm limit
violated
Unsure,
last usable value,
value constant
Bad,
not connected, value
constant
Diagnostics messages
Bit Meaning of "1"
0
1
Cause
Lower configured alarm limit
violated.
Input condition "fail safe" is
fulfilled, the parameterized
safety setting is set to "keep
last valid value".
Variable is not calculated,
Cause
SITRANS P DS III/P410 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00053276-08
Measure
Correct error through
user program.
Check the data meas-
urement.
Correct the "transmitter
type" setting.
Measure