34 Unidrive M SI-PROFIBUS User Guide
Issue Number: 3
Network loss detection is not enabled internally until cyclic data has been detected. This
prevents spurious network loss timeouts while the SI-PROFIBUS master controller is
initializing the PROFIBUS-DP network.
Pr S.01.011 determines the action to take when a timeout specified by Pr S.01.010
occurs. All possible actions and descriptions are listed below.
When a value of "Trip" is selected in Pr S.01.011 and no cyclic communications have
been detected in a time period defined by Pr S.01.010 then the drive will trip displaying
"SlotX Error" with a sub-trip string of "Link loss".
If the network loss timeout time (Pr S.01.010) is reduced too far, spurious network
losses may occur due to a time-out occurring before the time period under normal
operating conditions.
If Pr S.01.011 is set to "Send flt values", the fault values entered in Pr S.04.001 to
Pr S.04.032 are sent to the mapped output parameters when a network timeout error
occurs. If a valid PROFIBUS message is subsequently detected then the PLC output
values will be written as normal
e.g. if Pr S.03.001 = 20021 and Pr S.03.002 = 20022 and a timeout error occurs, the
value in Pr S.04.001 will be sent to Pr 20.021 and the value in Pr S.04.002 will be sent
to Pr 20.022 as defined in the out mapping parameters.
If Pr S.01.011 is set to "Clear output", all PLC output parameter values are set to zero in
the event of a network loss timeout occurring.
e.g. if Pr S.03.001 = 20021 and Pr S.03.002 = 20022 and a timeout error occurs,
Pr 20.021 and Pr 20.022 will be set to 0.
If Pr S.01.011 is set to "Hold last", the last values sent by the PLC are held in the
mapped output parameters in the event of a network loss timeout occurring.
e.g. if Pr S.03.001 = 20021 and Pr S.03.002 = 20022 and a timeout error occurs,
Pr 20.021 and Pr 20.022 will equal the last values sent by the PLC.
If Pr S.01.011 is set to "No action", then the module will not write any value to any
mapped output parameters.
Timeout action
S.01.011
Default Trip (0)
Range Trip (0) to No action (4)
Access RW
Value Text Description
0 Trip Trip the drive
1 Send flt values Send fault values to output parameters
2 Clear output PLC output parameters will have values set to zero
3 Hold last Hold the last value in the PLC output parameters
4 No action No action with output parameters
Network loss detection can be disabled by setting Pr S.01.010 to 0. It is the user's
responsibility to ensure that adequate safety precautions are taken to prevent damage
or injury by disabling the drive in the event of a loss of communications.
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