SMC Networks LECSN-T Series

8. TROUBLESHOOTING
8 - 45
Alarm No.: 67
Name: Encoder normal communication error 1 (safety observation function)
Alarm content
・
An error has occurred in the communication between an encoder and driver.
Detail
No.
Detail name
Cause
Check method
Check result
Action
67.1
Encoder normal
communication
- Receive data
error 1 (safety
observation
function)
(1)
An encoder cable is
malfunctioning.
Check if the encoder
cable is disconnected
or shorted.
It has a failure.
Repair or replace the cable.
It has no failure.
Check (2).
(2)
The driver is
malfunctioning.
Replace the driver, and
then check the
repeatability.
It is not repeatable.
Replace the driver.
It is repeatable.
Check (3).
(3)
An encoder is
malfunctioning.
Replace the servo
motor,and then check
the repeatability.
It is not repeatable.
Replace the servo motor.
It is repeatable.
Check (4).
(4)
Something near the
device caused it.
Check the noise,
ambient temperature,
vibration,etc.
There is a problem in
thesurrounding.
Take countermeasures
against its cause.
67.2
Encoder normal
communication
- Receive data
error 2 (safety
observation
function)
Check it with the check method for [AL. 67.1].
67.3
Encoder normal
communication
- Receive data
error 3 (safety
observation
function)
67.4
Encoder normal
communication
- Receive data
error 4 (safety
observation
function)
67.7
Encoder normal
communication
- Transmission
data error 1
(safety
observation
function)
Alarm No.: 68
Name: STO diagnosis error
Alarm content
・

An error of STO input signal was detected.

Detail
No.
Detail name
Cause
Check method
Check result
Action
68.1
Mismatched
STO signal error
(1)
STO1 and STO2 are not
inputted correctly.
Check if the STO1 and
STO2 of CN8
connector are wired
correctly.
It is not wired
correctly.
Wire it correctly.
It is wired correctly.
Check (2).
(2)
The input states of
STO1 and STO2 are
different.
Check the on/off states
of STO1 and STO2.
The on/off states of
STO1 and STO2 are
different.
Set STO1 and STO2
to the same input
states.
The on/off states of
STO1 and STO2 are
the same.
Check (3).
(3)
The setting of [Pr. PF18
STO diagnosis error
detection time] ([Pr.
PX43] for when the J3
extension function is
used) is incorrect.
Set a longer time in the
parameter, and then
check the repeatability.
It is not repeatable.
Review the parameter
setting.
It is repeatable.
Check (4).
(4)
The STO circuit is
malfunctioning.
Replace the driver, and
then check the
repeatability.
It is not repeatable.
Replace the driver.
It is repeatable.
Check (5).