Manual R1140-PB-E Release: 2.03 © Elotech GmbH Page 10/16
Byte 2: always 0x01
Byte 3
Instruction code, BC: 0x10 : Read parameter
0x20 : Write parameter
0x21 : Write parameter and store with powerfail protection
Take care: The EAROM or EEPROM of the slave
permits max. 1.000.000 write cycles.
Byte 4: always 0x00
Byte 5
Parameter code, PC: Enquiry:
Adresses the parameter which should be configured.
Answer:
If the read-proceeding to the slave was ok., than, in the answer of the slave,
byte 5 shows the parameter-code PC.
If the write-proceeding to the slave was ok., than, in the answer of the slave,
byte 5 shows the value 00H (acknowledge).
If the communication was not ok., the following error-warnings are shown in
byte 5:
03 H - Procedure error (instruction code not valid)
04 H - Non-compliance with specified range (value to low orto high)
05 H - Byte 2 ≠0
06 H - The adressed parameter is a read-only parameter
07 H - Writing of datas not possible. Slave status is not „remote“.
08 H - Parameter-code not valid
09 H - It is not possible, to execute the instruction
(e.g., the autotuning can´t be started)
FEH - Error during writing into the powerfail storage
FFH - General error
Byte 6, 7 und 8
Parameter value: The parameter value comprises three data bytes:
2 data byte (mantissa), 1 data byte (exponent).
Byte 6: Parameter value PWH
Byte 7: Parameter value PWL
Byte 8: Parameter value PWE
Examples: Dec. Hex. Mantissa Dec. point
Process value (°C): 215 00D7 00D7 00
Setpoint (°C): 230 00E6 00E6 00
Output ratio, cooling (%) -16 FFF0 FFF0 00
Setpoint ramp (°C/min): 2,2 0016 0016 01
The parameter value is calculated as follows: Dec.: 2,2 = 22 + 1 dec.point
Hex.: = 0016 (mantissa)
= 01 (1 dec. point)
Negative mantissa / negative Exponent: Built binary two´s complement.
