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Series 642
5.6.4.2
Network Status LED
This bi–color (green/red) LED indicates the status of the communication link. Table below define the
Network Status LED states.
State
Not Powered/Not On–line
On–line, Not Connected
Link OK
On–line, Connected
Connection Time–Out
Critical Link Failure
5.6.5
Safety mode
By means of an external switch (see connection diagrams «Electrical connection») the motor power
supply can be interrupted. In this case the valve enters the 'safety mode'. This motor interlock prevents
the valve from moving (e.g. maintenance work). Data reading from the control unit remains possible.
When motor interlock is active during power up the valve directly enters the 'safety mode' and is not able
to synchronize. Display shows 'D C' or 'D999'. In this case synchronization cycle will be done when
motor interlock is deactivated. Then Display shows 'INIT' for a moment followed by 'SYNC'.
When 'safety mode' is entered from operation (i.e. pressure control mode), the unit will automatically
switch to position control mode and remain at current position. Once motor interlock is deactivated the
unit remains in position control mode.
5.6.6
Service indication
This product is able to indicate that the valve unit needs to be cleaned, or an obstruction is present.
A service request is indicated when the control unit detects that motor steps are apparently not effective.
This may happen when the valve unit is heavily contaminated. These ‚lost' steps are recognized and will
be repeated to attempt target position in the short term. But in the medium term the valve unit requires
cleaning or inspection. 'Service request' (SR) would be indicated on the display or could be read via
remote operation. Refer to «Display information» for details.
605593EC
OPERATION
LED
Description
Off
Device is not on–line.
- The device has not completed the Dup_MAC_ID test yet.
- The device may not be powered, look at 'Status LED'
- No network power present.
Flashing
Device is on–line but has no connections in the established
Green
state.
- The device has passed the Dup_MAC_ID test, is on–line,
but has no established connections to other nodes.
- The device has no established connections.
Green
The device is on–line and has connections in the
established state.
- Is allocated to a Master.
- The device has one or more established connections.
Flashing
One or more I/O Connections are in the Timed–Out state.
Red
Red
Failed communication device. The device has detected an
error that has rendered it incapable of communicating on
the network
(Duplicate MAC ID, or Bus–off).
Edition 2017-11-24
83/113
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