Issue:
What are the non-blocking conditions which keeps the M580 CPU in RUN ?

Product Line:

M580 CPUs

Environment:

EcoStruxure Control Expert, Windows 10

Resolution:

The system enters a non-blocking condition when it detects an input/output error on the backplane bus (X Bus or Ethernet) or through execution of an instruction, which can be processed by the user program and does not modify the CPU status.

Conditions Linked to I/O Diagnostics:

• When an I/O error detected on one of the modules in the rack (%S10=1),
• An I/O error detected in the task in progress (%S16=1),
• An I/O error detected on rack address 0 to 7 (%S40...%S47=1),
• A channel error (%Ir.m.c.ERR =1 ) (implicit exchanges)
• Or a channel error word (%MWr.m.c.2 ) where its value indicates the type of error detected on the specified channel and depends on the I/O module (implicit exchanges)

This type of non-blocking condition will keep the CPU I/O LED and the module I/O LED on steady ON status.

Conditions Linked to Execution of the Program Diagnostics:

• When a character string manipulation error detected (%S15=1)
• A capacity overrun, error detected on a floating point, or division by 0 (%S18=1)
• Or an index overrun (%S20=1).

Note:
- A non-blocking condition keeps the CPU in RUN and doesn't trigger the power supply module relay of the M580 PLC.
- We can force the CPU to go in HALT status when a non-blocking errors linked to the execution of the program are detected (%S15, %S18 or %S20 =1), by setting the system bit %S78 (HALTIFERROR) to 1.

Released for: Schneider Electric Singapore