Beckhoff KL4494, Manual

Page: 35 / 40

Access from the user program
KL4494 35 Version: 2.0.0
R34: User scaling for analog input - gain (A
w
)
This register contains the gain factor of the user scaling for the analog input (default: 256
dec
, equivalent to a
gain factor of 1).
Scaling: Gain factor = R34 x 2
-8
User scaling for the analog input can be activated in the feature register via bit R32.0 [
}
34] .
R35: User default value for analog output
Here you can specify the user default value.
R36: User scaling for analog output - offset (B
w
)
This register contains the offset of the user scaling for the analog input (default: 0).
User scaling for the analog output can be activated in the feature register via bit
R32.8 [
}
34] .
R37: User scaling for analog output - gain (A
w
)
This register contains the gain factor of the user scaling for the analog output (default: 256
dec
, equivalent to a
gain factor of 1).
Scaling: Gain factor = R37 x 2
-8
User scaling for the analog output can be activated in the feature register via bit R32.8 [ } 34] .
5.5 Examples of Register Communication
The numbering of the bytes in the examples corresponds to the display without word alignment.
5.5.1 Example 1: reading the firmware version from Register 9
Output Data
Byte 0: Control byte Byte 1: DataOUT1, high byte Byte 2: DataOUT1, low byte
0x89 (1000 1001
bin
) 0xXX 0xXX
Explanation:
• Bit 0.7 set means: Register communication switched on.
• Bit 0.6 not set means: reading the register.
• Bits 0.5 to 0.0 specify the register number 9 with 00 1001
bin
.
• The output data word (byte 1 and byte 2) has no meaning during read access. To change a register,
write the required value into the output word.
Input Data (answer of the bus terminal)
Byte 0: Status byte Byte 1: DataIN1, high byte Byte 2: DataIN1, low byte
0x89 0x33 0x41
Explanation:
• The terminal returns the value of the control byte as a receipt in the status byte.
• The terminal returns the firmware version 0x3341 in the input data word (byte 1 and byte 2). This is to
be interpreted as an ASCII code:
◦ ASCII code 0x33 represents the digit 3
◦ ASCII code 0x41 represents the letter A
The firmware version is thus 3A.