SMC Networks EX600 Series Operation Manual page 32

Part No.
No. Problem
EX600-
Red LED is ON.
(Diagnosis is
activated)
"0 and 1" red
LEDs are ON.
7 AMB
Red LED is
flashing.
(Diagnosis is
activated)
Red/green all
LEDs are
flashing
alternately.
Red ST(M) LED is
8 flashing.
(Diagnosis is activated)
Red ST(M) LED is ON.
9
Red/green ST(M) LED is
flashing alternately.
Red PWR LED is ON.
(Diagnosis is activated)
10
Red PWR(V) LED is ON.
(Diagnosis is activated)
: Refer to "Diagnostic" (page 66) for details.
Presumed cause
Diagnosis error
Analogue input or output
device power supply is
short-circuited.
Input value has exceeded
the upper limit when set to
current input type range.
Diagnosis error
(1)Input value has
exceeded the upper or
lower limit of the range.
(2)Input or output value
(value set by user) has
exceeded the upper or
lower limit.
An internal memory error
occurred in the Analogue
input/ output unit.
Diagnosis error (SI unit)
(1)Valve is short-circuited.
(2)Valve is open-circuited.
(3)ON/OFF count of the
valve has exceeded
the set value.
An internal memory error
has occurred in the SI
unit.
Unit communication error
Power supply voltage for
control and input is
abnormal.
Power supply voltage for
output is abnormal.
-31-
Troubleshooting
Check the parts with error by using the LED display or

PLC or H.T. Re-wire the short-circuited part, and check
if the cable and analogue input or output device are
normal.
Check the following when the range of the Analogue
input unit is set to current input.
(1)Set the input value of the analogue input device so
that it does not exceed the upper limit.
(2)Voltage is input from the analogue input device.
Ensure the range of the Analogue input unit matches
the range of the analogue input device.
(1)If the input value from the analogue input device
exceeds the upper or lower limit of the range, select
the appropriate range so that the input value is within
the range. Or invalidate diagnosis.
(2)If the input (output) value from the analogue input
(output) device exceeds the upper or lower limit of the
user set value, adjust it so that the input (output)
value is within the range of the user set value. Or
invalidate diagnosis.
Turn OFF the power for the unit and then turn it ON
again. If the error is not eliminated, stop the operation
and contact SMC.
Check the parts with error by using the LED display or

PLC or H.T.
(1)Check the operation after replacing the valve.
(2)Check the operation after replacing the valve.
(3)Reset the ON/OFF count to zero or change the set
value. Or invalidate diagnosis.
Turn OFF the power for the unit and then turn it ON
again. If the error is not eliminated, stop the operation
and contact SMC.
Make sure that the units are connected correctly and are
not loose.
Supply 24 VDC ±10% for control and input power
source.
Supply 24 VDC +10/-5% for output power source.
No.EX※※-OMQ0016