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7
Diagnostics and troubleshooting
If problems occur during commissioning of the MA 21, you can refer to the following table.
Typical errors and their possible causes are described here as well as tips for their elimina-
tion.
No.
Error when switching on
1
No LED illuminates
RDY LED flashes for longer
2
than 30 s after start-up
With network operation, net-
3
work master (Addr. "00") does
not respond to the host
Master responds with "00S", the
4
connected slaves do not
respond
Master responds with "00S", all
connected slaves respond with
5
time-out (e.g. "01T, 02T, 03T
etc.)
other errors on start-up
Master and slaves respond with
6
"Addr.+S", but MA 21 with time-
out (e.g. 03T)
Leuze electronic
Error description
Diagnostics and troubleshooting
Possible error causes
• Incorrect polarity or improper
connection of operating volt-
age
• "Power-ON" function test
could not be carried out suc-
cessfully
No communication between
host and master:
• Incorrect interface type
plugged in
• Interface incorrectly con-
nected
• Incompatible data format
between host and MA 21
• DIP switch 3 set to "Service"
• Last slave address on the
master MA 21 not set
• DIP switch 4 set to "BCL"
• Interruption or polarity
reversal of the multiNet plus
interface (RS 485)
• The slaves have not recog-
nised the "multiNet" protocol
type and are using a different
data format
• MA 21 is not connected cor-
rectly or is using an incorrect
data format
• MA 21 is set to "Service"
MA 21
Measures
❏
Check connection, correct if
necessary
❏
Check the network wiring;
switch the operating voltage
off and back on again
❏
Replace interface module
❏
Correct according to the con-
nection diagram
❏
Check the data format and
change in the master setup
❏
Set DIP switch 3 to "Host"
❏
Use the rotary switch or mas-
ter setup to set the last slave
address
❏
Set DIP switch 4 to "MA 21"
❏
Test and correct the connec-
tion; wires A and B must not
be interchanged
❏
Test and correct settings for
the host protocol of the
slaves at the service interface
data format: multiNet mode
baud rate:
57600
protocol:
multiNet plus
slave
❏
Test the connection of the
MA 21, check host protocol
(see above)
❏
Switch MA 21 to "Operation"
33
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