Non blocking errors

General

This concerns an anomaly, provoked by an Input/Output error on the X-Bus, on the Fipio bus or by the execution of an instruction. It can be processed by the user program and does not change the PLC state.

Non blocking errors linked to Inputs/Outputs

The identification of a non blocking error linked to the Inputs/Outputs is signaled by:

the I/O state LED of the processor is lit,
the I/O state LEDs of the faulty modules are lit, (on X-Bus and Fipio bus),
the bits and error words associated with the channel:
- Inputs/Outputs on X-Bus:
  
  bit %I<r>.<m>.<c>.ERR = 1 indicates a faulty channel (implicit exchanges),
  
  words %MW<r>.<m>.<c>.2 indicates the channel fault type (explicit exchanges),
- Inputs/Outputs on Fipio bus:
  
  bit % I\2.<e>\0.<m>.<c>.ERR = 1 indicates a faulty channel (implicit exchanges),
  
  words %MW\2.<e>\0.<m>.<c>.2 indicates the channel fault type (explicit exchanges),
bits and error words associated with the module:
- Module on X-Bus:
  
  bit %I<r>.<m>.MOD.ERR = 1 indicates a faulty channel (implicit exchanges),
  
  words %MW<r>.<m>.MOD.2 indicates the channel fault type (explicit exchanges),
- Module on Fipio bus:
  
  bit %I\2.< e>\0.0.MOD.ERR = 1 indicates a faulty module (implicit exchanges),
  
  words %MW\2.<e>\0.0.MOD.2 indicates the module fault type (explicit exchanges),
system bits:

%S10: I/O error (on X-Bus or Fipio bus),

%S16: I/O error (on X-Bus and Fipio bus) in the task in progress,

%S40 to %S47: I/O error in racks at addresses 0 to 7 on the X-Bus.

Diagnostics table:

Status LED			System bits	Errors
RUN	ERR	I/O	System bits	Errors
i	i	On	%S10	Input/Output error: channel supply fault, channel disjointed, module not conforming to configuration, out of service, module supply fault.
i	i	On	%S16	Error on Input/Output in a task.
i	i	On	%S40 to %S47	Error on Inputs/Outputs at rack level (%S40: rack 0, %S47: rack 7)

Legend:

A: Lit LED,

i: State not determined.

Non blocking errors linked to program execution

The indication of a non blocking error linked to program execution is signaled by setting to state 1 of one or several system bits %S15, %S18, %S20.

The test and setting to state 0 of the system bits are controlled by the user.

Diagnostics table:

Status LED			System bits	Errors
RUN	ERR	I/O	System bits	Errors
On	i	i	%S15=1	Character string manipulation error.
On	i	i	%S18=1	Capacity overrun, error on floating point or division by 0.
On	i	i	%S20=1	Index overflow.

Legend:

A: Lit LED,

i: State not determined.

NOTE: The program diagnostics function, accessible through the programming software or the bit %S78, enables certain non blocking errors linked to the program execution, to be turned into blocking errors. The nature of the error is indicated in the system word %SW 125.