NORD Drivesystems BU0135 - Manual (Page 59)

4 Commissioning
BU 0135 GB-2713 Pre-series version 59
4.4.5 Process data
Process data are used to control the motor starter and communicate its status. The transfer of this data is
carried out cyclically. There is only one process data object (PDO) for the motor starter, with a fixed data
length of 1 Byte. A differentiation is made between the setpoint PPO (from the PLC to the starter) and the
actual value PPO (from the starter to the PLC).
Structure of the setpoint PDO:
Setpoint PPO
Bit Function Explanation
Bit 0 Enabled right See the following table
Bit 1 Enable left
Bit 2 Acknowledge fault With a change from 0 to 1, a starter fault is acknowledged
Bit 3 Release brake manually 0 = Brake is applied or will be released automatically if required
1 = Brake will be released immediately
Bit 4 – 7 Vacant These bits do not have any function
Explanation of the Enable bits:
Enabled right Enable left Explanation
0 0 Motor is switched off
0 1 A rotating field in the left hand direction is present at the motor
1 0 A rotating field in the right hand direction is present at the motor
1 1 Motor is switched off
Structure of the actual value PDO:
Actual value PPO
Bit Function Explanation
Bit 0 Status Bit 0 (Fault) See the following table
Bit 1 Status Bit 1 (Operation)
Bit 2 Status of initiator 1 (DIN3 / C1) Shows the logic level at input DIN3
Bit 3 Status of initiator 2 (DIN4 / C2) Shows the logic level at input DIN4
Bit 4 – 7 Vacant These bits do not have any function
Explanation of status bits:
Status Bit 1 Status Bit 0 Status
0 0
Error active
0 1
Standby (motor stationary)
1 0
Warning (but motor running)
1 1
Run (motor running without warning)
WARNING
In case of malfunction (interruption of communication or break in the PROFIBUS
cable) the motor starter switches off automatically. In order to prevent a re-start
on restoration of communication, the PROFIBUS master must actively set the
control bits to "Zero".