Balluff FT 50 RLA Serie Instructions De Service Et De Montage page 63

Mounting and
operating instructions
The 1st byte always includes the sensor address. In addition, it is characterized by the selction bit (D7 = 1). This
means that this byte is decimal: always „address +128". The selection bit is not set (D7=0) with any other bytes.
When the master sends a byte with a set selection bit, a new data transfer cycle is started, regardless of whether the
previous cycle has been completed.
The last byte is the check sum which is formed from the bitwise exclusive disjunction of all previous bytes. When
calculating the check sum, the 8
bit)  129 = 1! If the sensor address is changed, the check sum for each command must be recalculated.
In the command telegram, the 3rd byte can adopt the values listed in the chapter 8.5 "Examples for master
commands".
In the sensor's reply telegram, the 3rd byte (reply) can only adopt the following values:
Possible reply telegram from sensor
Decimal Hex.:
89 59
78 4E
12 bit and 7 bit data is transferred in the parameter bytes (4th byte to (n-1) byte). The following formats are used:
Possible parameter format:
7 bit data byte
D7 D6 D5 D4
0 Data byte bit [6..0]
12 bit data item: data 1
Byte i
D7 D6 D5 D4
0 0 Data item bit [11..6]
D0 - D11 = distance value 0 - 4095 (according to the set measuring range)
12 bit data item: data 2
Byte i
D15 D14 D13 D12
0 Data item bit [14..8]
12 bit data item: data 3 (with switching output recognition Q1 in bit D6, Byte i+1) and Good Target (GT at bit D6 Byte):
Byte i
D7 D6 D5 D4
0 GT Data item bit [11..6]
D0 - D11 = distance value 0 - 4095 (according to the set measuring range)
Q = status of Q
1 1
GT = Good Target
12 bit data item: data 4
Byte i
D7 D6 D5 D4
0 1 Data item bit [11..6]
D0 - D11 = distance value 0 - 4095 (according to the set measuring range)
FT 50 RLA Disctance sensor - GB - 068-13671 - 19.05.2016-12
bit (selection bit D7) must be deducted from the first byte (address and selection
th
ASCII Meaning
Y Command has been carried out
N Command could not be carried out;
Possible causes: check sum or parameter / command incorrect
D3 D2 D1 D0
D3 D2 D1 D0
D11 D10 D9 D8
D3 D2 D1 D0
D3 D2 D1 D0
Byte i + 1
D7 D6 D5 D4
0 0 Data item bit [5..0]
Byte i + 1
D7 D6 D5 D4
0 Data item bit [6..0]
Byte i + 1
D7 D6 D5 D4
0 Q Data item bit [5..0]
1
Byte i + 1
D7 D6 D5 D4
0 0 Data item bit [5..0]
D3 D2 D1 D0
D3 D2 D1 D0
D3 D2 D1 D0
D3 D2 D1 D0
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