Communication With Cu - Grundfos OD 401 Montage- Und Betriebsanleitung

Access code
Fig. 5 Example of the access code pop-up
display
The entire setup or parts of it can be protected by an
access code.
An access code is a combination of five button
presses. The nine buttons on the operator display
can be used, e.g. plus, minus, esc, minus, plus.
If an attempt is made to enter a value which is pro-
tected by an access code, the display in fig. 5 will
appear. The display is not "locked" and it is possible
to go on by pressing the esc button or by going to
somewhere else in the menu.
Warning
Fig. 6 Example of the warning pop-up display
The warning display appears if a value having con-
sequence for the operation is being changed.
It is possible to regret the entry:
• Press the esc button to regret the entry.
• Press the ok button to activate the entered value.
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Communication faults
Fig. 7 Example of the communication faults
pop-up display
This display appears if the communication between
the OD 401 and the CU 401 has been interrupted.
Possible faults:
• The power supply has been switched off, but the
OD 401 has its own power supply.
• Cable connection is defective.
• Module fault.

7. Communication with CU 401

The communication between the OD 401 and the
CU 401 takes place via the COMLI protocol
(RS-485).
The OD 401 functions as "master" and the CU 401
as "slave".
The OD 401 must be connected to the CU 401 via a
screened, twisted-pair standard cable (RS-485).
The cable ends are fitted in terminals.
Terminal sizes and designations appear in section
8. Electrical data.