Diagnostics and troubleshooting
9
9.1
Meaning of the LED states on SITRANS MX300
LED state
Error
Causes and remedies
LEDs 1 to 8 flashing green 2x per second.
ERR LED lit red.
Modbus address of the SITRANS MX300
is invalid.
Two devices have the same Modbus ad‐
dress.
• Select an individual Modbus address
for each connected SITRANS MX300.
See section Installing SI‐
TRANS MX300 on DIN rail (Page 38).
LEDs 1 to 8 do not light up.
Channel is not active.
Channel not enabled on the SI‐
TRANS CC240 web server.
• Call up the SITRANS CC240 web serv‐
• Click on the menu in top-left and se‐
lect Configuration.
• Select Device / channel access and
enable the channel.
LED 1 to 8 are lit green.
Channel active Device detected.
-
LED 1 to 8 flash green.
Channel active No device detected.
• Enable or disable the HART resistor at
the SITRANS MX300. Refer to sec‐
tion: Installing SITRANS MX300 on
DIN rail (Page 38).
LEDs 1 to 8 light up during booting.
Signals the set Modbus address of the
SITRANS MX300.
-
ERR LED lit red.
Modbus communication errors.
For example, 2 devices have the same
Modbus address.
• Switch the system off and on again.
ERR LED flashes red 2x per second.
Channel fault.
For example, channel is active but no de‐
vice is connected.
ERR LED flashes red 4x per second.
Internal error.
• Return the SITRANS MX300 to Sie‐
mens.
PWR LED lit green.
Status supply voltage 24 V DC present /
ready for operation
PWR LED flashes green 2x per second.
Supply voltage is on. Initialize the device
PWR LED flashes green 4x per second.
FW update is executed.
SITRANS CC240 and SITRANS MX300
Operating Instructions, 06/2021, A5E47280695-AB
69
