LED Diagnostics for M580 Hot Standby CPUs

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:

NOTE: The SRUN and SMOD LEDs apply only to safety CPUs.

For a description of the safety PAC LEDs SRUN and SMOD, 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:

A/B/Clear Rotary Switch Polition	LED
A/B/Clear Rotary Switch Polition	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 HSBY 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 PPRIM, 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:

SFP socket for copper or fiber-optic Hot Standby link connection

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.
ACT	Green	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.