6. REDUNDANCY WITH NX3030 CPU
Direct Variable
AT variable
DG_NX4010.tRedundancy.
RedDgnLoc.sGeneral_Diag.*
Description
Variable Bit
%QW(n+13) - wConfigErrorCode
Error code discovered during the configu-
ration process in the Not-Configured state.
See ConfigError diagnostics described pre-
viously.
%QD(n+15) - dwApplicationCRC
32 bits application project CRC, used to
detect differences between the application
projects of the 2 PLCs.
%QD(n+19) - dwArchiveCRC
32 bits project archive CRC, used to detect
differences between the project archive of
the 2 PLCs.
%QD(n+23) - dwFirmwareVersion
This PLC firmware version, used to ver-
ify the compatibility between both PLC
firmware.
%QD(n+27) - dwIECTimer
The IEC Timer synchronization is neces-
sary for the bump-less operation of some
function block as TON and TOF. Through
this diagnostic the IEC Timer from the
Active PLC is received and updated in
the Non-Active PLC, since the Diagnostics
and Commands Exchange service has been
executed successfully. The counting starts
at 0 and is incremented up to 4294967295.
After counting overflow restarts with 0.
%QW(n+31) - wCycleCounter
16 bits counter, used as sequence auxil-
iary information in the Redundancy Event
Log. In the Active PLC, it’s incremented
each MainTask cycle. In the Non-Active
PLC, receives a copy of the value existent
in the Active PLC, since the Diagnostics
and Commands Exchange service has been
executed successfully. The counting starts
at 0 and is incremented up to 65535. After
counting overflow restarts with 0.
Table 209: Redundancy General Diagnostics
Notes:
Diagnostics Structures Visualization: The diagnostics structures added to the project can be visualized accessing the
Library Manager from the tree view in the MasterTool IEC XE window. With that it’s possible to visualize all data types
defined in the structure.
Direct Representation Variables: The “n” represents the configured value in the NX4010 module, through MasterTool
IEC XE software, as a %Q Start Address of Module Diagnostics. This definition is true for all diagnostics structure.
AT Directive: The AT directive is a word reserved in the programming software which is connected to a variable address.
In case of a NX4010 module the DG_NX4010 variable is related to the module diagnostics initial address.
The “sNETA_Diag” substructure has the following fields for NETA synchronism channels diagnostics:
DG_NX4010.tRedundancy.RedDgnLoc.sGeneral_Diag.bExchangeSync: When this diagnostic variable is with value
FALSE, is not possible to define the state of some other diagnostics, such as bIncompatibleFirmware, bApplicationProjectDiff
and bProjectArchiveDiff. There will not represent the correct value because they depend on the correct functioning of the
communication between the two CPUs, so that information can be correctly generated.
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