ALTUS Nexto Series User Manual

4. INITIAL PROGRAMMING
4.13.4. Exception
When a CPU is in Exception it indicates that some improper operation occurred in one of the application active tasks. The
task which caused the Exception will be suspended and the other tasks will pass for the Stop mode. It is only possible to take
off the tasks from this state and set them in execution again after a new CPU start condition. Therefore, only with a Reset
Warm, Reset Cold, Reset Origin or a CPU restart puts the application again in Run mode.
4.13.5. Reset Warm
This command puts the CPU in Stop mode and initializes all the application tasks variables, except the persistent and
retentive type variables. The variables initialized with a specific value will assume exactly this value, the other variables will
assume the standard initialization value (zero).
4.13.6. Reset Cold
This command puts the CPU in Stop mode and initializes all the application tasks variables, except the persistent type
variables. The variables initialized with a specific value will assume exactly this value, the other variables will assume the
standard initialization value (zero).
4.13.7. Reset Origen
This command removes all application task variables, including persistent type variables, deletes the application CPU and
puts the CPU in Stop mode.
Notes:
Reset: When a Reset is executed, the breakpoints defined in the application are disabled.
Command: To execute the commands Reset Warm, Cold or Origin, it’s necessary to have MasterTool IEC XE in Online
mode with the CPU.
4.13.8. Reset Process Command (IEC 60870-5-104)
This process reset command can be solicited by IEC 60870-5-104 clients. After answer the client, the CPU start a rebooting
process, as if being done an energizing cycle.
In case of redundant PLCs, the process reset command is synchronized with the non-active PLC, resulting the reboot of
both PLCs.
The standard IEC 60870-5-104 foresee a qualification value pass (0..255) with the process reset command, but this “pa-
rameter” is not considered by the CPU.
4.14. Programs (POUs) and Global Variable Lists (GVLs)
The project created by MasterTool IEC XE contains a set of program modules (POUs) and global variables lists that aims
to facilitate the programming and utilization of the controller. The following sections describe the main elements that are part
of this standard project structure.
4.14.1. MainPrg Program
The MainTask is associated to one unique POU of program type, named MainPrg. The MainPrg program is created
automatically and cannot be edited by user.
The MainPrg program code is the following, in ST language:
(
*
Main POU associated with MainTask that calls StartPrg,
UserPrg/ActivePrg and NonSkippedPrg.
This POU is blocked to edit.
*
)
PROGRAM MainPrg
VAR
isFirstCycle : BOOL := TRUE;
END_VAR
50

ALTUS Nexto Series Specifications

General

Brand	ALTUS
Model	Nexto Series
Category	Computer Hardware
Language	English