3D sensor
30
9.3.8 Transmit process values of the level measurement via PROFINET
The device can transmit the process values to a PLC via the PROFINET fieldbus. The process values are
displayed in the ifm Vision Assistant as output string as below:
Only one fieldbus can be active at a time. The fieldbus is adjustable
(→ software manual).
The output string is transferred to a PLC in the displayed sequence.
Observe the following remarks for the transmission of the output string to a PLC:
●
Bytes 0 to 7 are part of the output string. They are not displayed in the ifm Vision Assistant (see
screenshot above).
●
Semicolons ";" in the output string are not transferred.
●
Float values are converted into 16-bit integers before the transmission.
●
All numerical values are converted into binary 16-bit integers before the transmission.
The output string is composed of the following:
0
0
7
0
Byte no.
Data
Coding
Process value
Unit
Description
Comments
0
2#0010_0000 Binary
0.5
Duplicated
command word
Bit 0.5 shows a successful
trigger command
1
2#0000_0000 Binary
2
2#0000_0000 Decimal
Synchronous /
asynchronous
message
identification
3
2#0000_0000 Decimal
4
0
Decimal
30
Message counter
●
The device has received
30 messages.
●
Increments by 1 with
each action (trigger,
message sent etc.).
5
30
Decimal
6
0
Decimal
Reserved
7
0
Decimal
8
0
Decimal
0
Status of all ROIs
(0 = bad, 1 = good)
Shows the status of the
level measurement
9
0
Decimal
10
0
Decimal
0
ROI ID
ROI status:
0 = good
6 = overfill
7 = underfill
11
0
Decimal
12
0
Decimal
7
ROI status
13
7
Decimal
14
0
Decimal
0
mm
ROI value
15
0
Decimal
Faulty execution of a command leads to the following status:
●
Error bit = 1
●
Duplicated command word is displayed
●
Asynchronous message bit = 0
●
Asynchronous message identification = 0
●
Message counter increments by 1
