LED Panel
The front face of a BMEH58•040 Hot Standby CPU presents the following LED panel, which you can use to diagnose the state of the M580 Hot Standby system:
For a description of the safety PAC LEDs and , refer to the topic LED Displays for the M580 Safety CPU and Copro in the Modicon M580, Safety System Planning Guide.
For a presentation of LED diagnostics for safety CPUs, refer to the topic M580 Safety CPU LED Diagnostics in the Modicon M580, Safety Manual.
Hot Standby Panel LEDs
Use the BMEH58•040 Hot Standby CPU A and B LEDs to identify the PAC configurations, as set by the rotary switch on each CPU:
LED |
||
|---|---|---|
A |
B |
|
Local PAC is A, remote PAC is B |
ON |
OFF |
Local PAC is B, remote PAC is A |
OFF |
ON |
Both PAC configured as A |
Flashing |
OFF |
Both PAC configured as B |
OFF |
Flashing |
Local rotary switch on CLEAR |
Flashing |
Flashing |
In the Hot Standby Panel LED diagnostic presentation, above:
The local PAC is the PAC whose LEDs you are observing, which could be either A or B.
The remote PAC is the PAC whose LEDs you are not observing, typically located in a remote location.
For example, consider the design where the two PACs are physically distant but communicate via a tunnel, with a PAC located at each tunnel terminus. In this case, the local PAC is the one in front of you; the remote PAC is the one at the distant end of the tunnel. But, if you move to the other end of the tunnel, the formerly remote PAC becomes the local PAC and the original local PAC becomes the remote PAC. By contrast, the designations of PAC A and PAC B do not change.
Use the BMEH58•040 REMOTE RUN LED on the local PAC to identify the operational status of the remote PAC:
REMOTE RUN LED |
Remote PAC State |
|---|---|
ON |
RUN |
Flashing |
STOP |
OFF |
Indeterminate |
Use the BMEH58•040 PRIM, and STBY LEDs to identify the operational status of the local and remote PAC:
LED |
PAC State |
||
|---|---|---|---|
PRIM |
STBY |
Local PAC |
Remote PAC |
ON |
OFF |
Primary |
Standby |
ON |
Flashing |
Primary |
Wait |
Flashing |
Flashing |
Wait |
Indeterminate |
OFF |
OFF |
Wait |
Indeterminate |
OFF |
ON |
Standby |
Primary |
Hot Standby Link LED
A Hot Standby link LED is located on the front of the BMEH58•040 CPU:
1 SFP socket for copper or fiber-optic Hot Standby link connection
2 Hot Standby link LED
Use this LED to diagnose the state of the Hot Standby link:
Status |
Color |
Description |
|---|---|---|
on |
green |
The port is communicating with the remote PAC. |
blinking |
green |
The port is configured and operational, but a Hot Standby link is not made. |
off |
— |
The Hot Standby link is not configured or is not operational. |
Ethernet Port Connector LEDs
Each Ethernet RJ45 connector presents a pair of LED indicators:
The Ethernet connector LEDs indicate the following states:
LED |
Color |
State |
Description |
|---|---|---|---|
ACT |
Green |
Flashing |
Data is being transmitted over the link. |
Off |
No transmission activity is occurring. |
||
LNK |
Green |
On |
Link speed = 100 Mbit/s. |
Yellow |
On |
Link speed = 10 Mbit/s. |
|
Green / Yellow |
Off |
No link is established. |
Non-Hot Standby Panel LEDs
Refer to the following topics for additional information regarding non-Hot Standby LEDs:
LED Diagnostics for M580 Standalone CPUs in the Modicon M580 Hardware Reference Manual for standalone, non-safety LEDs.
M580 Safety CPU LED Diagnostics in the M580 M580 Safety Manual, for safety LEDs.