Beckhoff KL3403 Series, Документация

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Access from the user program
KL3403 55 Version: 3.1.0
Note the permissible range of the measured value output
The KL3403 should only take the transformer ratio into account if the calculated resulting current
does not exceed the value 65535!
If the calculated result does exceed 65535, the transformer ratio should be taken into account in the
PLC.
R38: Time constant for automatic deletion of the minimum and maximum values
If bit R32.7 [ } 54] is enabled, the minimum and maximum current, voltage and power values of the respective
phase are cleared after the set time.
• Default value: 2000 ms (R38 = 200)
• Resolution: 10 ms
• Range of values: 10 ms to 655350 ms
R39: Measuring cycle time
With this register, the measuring cycle time of the A/D converter is set:
• Default value: 50 ms
• Resolution: 1 ms
• Range of values: 1 ms to 65535 ms
The correct setting of the measuring interval depends on the mains frequency, among other factors (see
chapter
Basic function principles [
}
14] ).
5.6 Examples of Register Communication
The numbering of the bytes in the examples corresponds to the display without word alignment.
5.6.1 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