Parameters 403
60.58 DDCS controller
comm loss time
Sets a timeout for communication with the external controller.
If a communication break lasts longer than the timeout, the
action specified by parameter 60.59 DDCS controller comm
loss function is taken.
As a rule of thumb, this parameter should be set to at least 3
times the transmit interval of the controller.
Notes:
• There is a 60-second boot-up delay immediately after
power-up. During the delay, the communication break
monitoring is disabled (but communication itself can be
active).
• With an AC 800M controller, the controller detects a
communication break immediately but re-establishing the
communication is done at 9-second idle intervals. Also
note that the sending interval of a data set is not the same
as the execution interval of the application task. On
ModuleBus, the sending interval is defined by controller
parameter Scan Cycle Time (by default, 100 ms).
100 ms
0…60000 ms Timeout for communication with external controller.
60.59 DDCS controller
comm loss function
Selects how the drive reacts to a communication break
between the drive and the external controller.
Fault
No action No action taken (monitoring disabled). 0
Fault Drive trips on 7581 DDCS controller comm loss. This only
occurs if control is expected from the external controller, or if
supervision is forced using parameter 60.65 DDCS controller
comm supervision force.
1
Last speed Drive generates an A7CA DDCS controller comm loss
warning and freezes the speed to the level the drive was
operating at. This only occurs if control is expected from the
external controller, or if supervision is forced using parameter
60.65 DDCS controller comm supervision force.
The speed is determined on the basis of actual speed using
850 ms low-pass filtering.
WARNING! Make sure that it is safe to continue
operation in case of a communication break.
2
Speed ref safe Drive generates an A7CA DDCS controller comm loss
warning and sets the speed to the speed defined by
parameter 22.41 Speed ref safe (or 28.41 Frequency ref safe
when frequency reference is being used). This only occurs if
control is expected from the external controller, or if
supervision is forced using parameter 60.65 DDCS controller
comm supervision force.
WARNING! Make sure that it is safe to continue
operation in case of a communication break.
3
Fault always Drive trips on 7581 DDCS controller comm loss. This occurs
even though no control is expected from the external
controller.
4
Warning Drive generates an A7CA DDCS controller comm loss
warning. This only occurs if control is expected from the
external controller, or if supervision is forced using parameter
60.65 DDCS controller comm supervision force.
WARNING! Make sure that it is safe to continue
operation in case of a communication break.
5
No. Name/Value Description Def/FbEq16
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