Display
Original instructions
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Introduction
There are several LEDs available on the front panel of each processor, enabling rapid diagnosis of the PLC status.
These LEDs provide information on:
Illustration
The following diagram shows the physical location of the LEDs on the front panel of a BMX P34 ••••• processor:
BMX P34 1000/2000 Processors LEDs
The following diagram shows the diagnostic LEDs on the BMX P34 1000/2000 processors:
BMX P34 2010 Processor LEDs
The following diagram shows the diagnostic LEDs on the BMX P34 2010 processor:
BMX P34 2020 Processor LEDs
The following diagram shows the diagnostic LEDs on the BMX P34 2020 processor. Note that two displays exist, depending on whether you are using V1 or V2 (or greater) of the processor.
BMX P34 2030 Processor LEDs
The following diagram shows the diagnostic LEDs on the BMX P34 2030 processor. Note that two displays exist, depending on whether you are using V1 or V2 (or greater) of the processor.
Memory Card Access LED
There is also a memory card access LED on each BMX P34 ••••• processor.
Description
The following table describes the meaning of RUN, ERR, I/O, SER COM, CARDERR, CAN RUN, CAN ERR, ETH STS and CARDAC LED on the front panel.
Label
Pattern
Indication
RUN (green): operational state
on
PLC functioning normally, program running
flashing
PLC in STOP mode or blocked by a software detected error
off
PLC not configured (absent, invalid, or incompatible application)
ERR (red): detected error
on
Processor or system detected error
flashing
  • PLC not configured (absent, invalid or incompatible application)
  • PLC blocked by a software detected error
off
Normal status (no internal detected errors)
I/O (red): input/output status
on
  • Input/output detected error originating from a module or channel
  • Configuration detected error
off
Normal status (no internal detected errors)
SER COM (yellow): serial data status
flashing
Data exchange on the serial connection in progress (receiving or sending)
off
No data exchange on the serial connection
CARDERR (red): memory card detected error
For further information, see project backup management for Modicon M340 PLCs
on
  • Memory card absent
  • Memory card not recognized
  • Memory card content differs from the application saved in the processor
off
  • Memory card recognized
  • Memory card content identical to the application saved in the processor
CAN RUN (green): CANopen operations
on
CANopen network operational
rapid flashing (on for 50 ms, off for 50 ms, repeating)
Automatic detection of data flow or LSS services in progress (alternates with CAN ERR)
slow flashing (on for 200 ms, off for 200 ms, repeating)
CANopen network pre-operational
1 flash
CANopen network stopped
3 flashes
downloading CANopen firmware
CAN ERR (red): CANopen detected errors
on
CANopen bus stopped
rapid flashing (on for 50 ms, off for 50 ms, repeating)
Automatic detection of data flow or LSS services in progress (alternates with CAN RUN)
slow flashing (on for 200 ms, off for 200 ms, repeating)
CANopen configuration not valid
1 flash
At least one of the detected error counters has reached or exceeded the alert level
2 flashes
A guard event (NMT-slave or NMT-master) or a heartbeat event has taken place
3 flashes
The SYNC message was not received before the end of the communication cycle period
off
No CANopen detected error
off
No communication activity
ETH STS (green): Ethernet communication status
on
Communication OK
2 flashes
Invalid MAC address
3 flashes
Ethernet link not connected
4 flashes
Duplicate IP address
5 flashes
Waiting for a server IP address
6 flashes
Secure and safe mode (with default IP address)
7 flashes
Configuration conflict between rotary switches and internal configuration
CARDAC (green): memory card access
Note: This LED is located under the memory card door.
on
Access to the card is enabled
flashing
Activity on the card; during each access, the card LED is set to OFF, then back to ON
off
Access to the card is disabled. It is possible to extract the card after the access to the card has been disabled by generating a rising edge on the bit %S65.
The following table describes the meaning of the ETH ACT and ETH 100 LED on the front panel for V1.
Label
Pattern
Indication
ETH ACT (green): Ethernet communication (transmission/reception) activity
on
Ethernet link detected: no communications activity.
off
No Ethernet link detected.
flashing
Ethernet link and communications activity detected.
ETH 100 (green): Ethernet transmission speed
on
Ethernet transmission at 100 Mbit/s (Fast Ethernet).
off
Ethernet transmission at 10 Mbit/s (Ethernet) or no link detected.
The following table describes the meaning of the ETH ACT and ETH LNK LED on the front panel for V2.
Label
Pattern
Indication
ETH ACT (green): Ethernet communication (transmission/reception) activity
on
Communication activity detected.
off
No communication activity detected.
ETH LNK (green): Ethernet link status
on
Ethernet link detected.
off
No Ethernet link detected.
off
No communication activity
NOTE: Rapid flashing is defined as ON for 50 ms and OFF for 50 ms.
NOTE: Slow flashing is defined as ON for 200 ms and OFF for 200 ms.