IAI America SCON-CA - Manual (Page 254)

Chapter 9
Troubleshooting
244
9.2.4 Impossible Communication
Situation Possible cause Check/Treatment
� Not connectable with
host machine
� Not connectable with
ROBONET
1) Communication rates do not match.
2) The machine number (station
number) is set to be duplicate with
that of another unit or out of the
range.
3) Parameter No.17 “Minimum delay
time for slave transmitter activation”
is set incorrectly.
4) Poor wiring or disconnection of
communication cable�
1) Set the communication rate to
match that of the host machine.
[Refer to the Instruction Manual
of the host unit.]
2) Correct the unit number (station
number) setting.
Machine numbers (station
numbers) vary depending on
communication modes. Refer to
the Instruction Manual of each
communication mode. (Note 1)
3) If the host device is that other
than ROBONET and RS485 is
used, and the host is in the
response timeout error, adjust
Parameter No.17 to a smaller
value (2 as reference). In any
other cases, increase or
decrease the value at will to
change the send/receive timing.
(If the operation is performed
properly, the transmission cycle
of the host is too fast. Always
check the response of SCON
before next transmission.)
If the controller is connected to
ROBONET, set the value or
parameter No.17 to “2". (Refer
to the Instruction Manual of
ROBONET [separate volume].)
If the controller is connected to
each of field buses (other than
RS485), it is unnecessary to
take the value of parameter
No.17 into account.
4) Review the wiring again. Check
if termination resistances are
connected to network terminals
with correct values.
(Note 1) Refer to the following Instruction Manual for communications:
� RS485························ Section 10.1
� DeviceNet ·················· DeviceNet Instruction Manual (separate volume)
� CC-Link ······················ CC-Link Instruction Manual (separate volume)
� PROFIBUS················· PROFIBUS Instruction Manual (separate volume)
� CompoNet·················· CompoNet Instruction Manual (separate volume)
� MECHATROLINK······· MECHATROLINK Instruction Manual (separate volume)
� EtherCAT ··················· EtherCAT Instruction Manual (separate volume)
� EtherNet/IP ················ EtherNet/IP Instruction Manual (separate volume)
� ROBONET ················· ROBONET Instruction Manual (separate volume)