KEYENCE N-410 User Manual
Page 125
7-9
7-2
Device Assignments
PLC
7
Operation with connection errors and connection type errors
When using the N-410 in multi-drop link mode and
• the power to a code reader is turned off
• the code reader is removed from its communication unit
• a cable is removed
• a device with a connection type other than that used by the N-410 is connected to the network
• a communication error occurs
the N-410 and code reader will be unable to communicate and operation will proceed as follows.
* The above is only true for multi-drop link mode. This does not apply to multi-head mode.
* Add addresses after the A+04 address will contain the remnants of the previous data.
If the N-410 is turned on before the code reader, the N-410 will attempt to establish
communications before the code reader is ready and the above error will result. Program
the device to ignore this error on startup.
Address
DM contents
Operation at time of error
A+00
Data write flag area
Operation is the same as for normal data writing.
A+01
ID number
"FFFF" is written.
A+02
Digits
"1" is written.
This is because the error code written in the A+03
address is a single character.
A+03
1st and 2nd digits of data
"N" is written to the 1st digit.
Note