ALTUS Nexto NX3004 User Manual

6. Redundancy with NX3030 CPU
345
ATTENTION:
Some diagnostics may point to possible failures during the redundant system initialization and in the
tasks first cycles. But in a correct system function these diagnostics no longer indicate errors right
after the system initialization.
PX2612 Panel Test
The PX2612 panel is composed by buttons, LEDs and relays. Many of these resources are not used
very often, thus are rarely tested and the defects may not be detected. It’s important to run tests from
time to time in order to verify if these resources are working properly, to avoid obscure failures to
prevent the PX2612 use when it’s necessary.
Test Mode Entry
The first step to test the PX2612 is to set it to test mode. This is done turning on the
DG_NX4010.tRedundancy.RedCmdLoc.bTestModeLocal command bit on both PLCs.
The PLC perceives that is in test mode when the following two bits are on:
 DG_NX4010.tRedundancy.RedCmdLoc.bTestModeLocal (RedCmdLoc.TestModeLocal on in
this PLC)
 DG_NX4010.tRedundancy.RedCmdRem.bTestModeLocal (RedCmdLoc.TestModeLocal on in
the other PLC)
When both bits are on, the PLC turns on the
DG_NX4010.tRedundancy.RedDgnLoc.sGeneral_Diag.bRedPanelTestMode diagnostic, to inform
that the PX2612 is in test mode.
Test Mode Manual and Automatic Outputs
The user can finish the test mode manually; turning off the
DG_NX4010.tRedundancy.RedCmdLoc.bTestModeLocal bit in both PLCs. Actually turning it off in
just one PLC is enough, as the test mode demands this bit to be on in both PLCs. However, this
practice is recommended.
In case the user forgets to turn off the DG_NX4010.tRedundancy.RedCmdLoc.bTestModeLocal bit,
it’s automatically turned off 15 minutes after being turned on, finishing automatically the test mode.
LEDs Testing
Thus, during the test mode, the 6 LEDs must blink, losing its normal utility, which is showing the
redundancy state.
Buttons Test
At pressing a button in the test mode, a correspondent LED stops blinking, and remains on. The
following Table 6-13 presents the connection between the pressed button and the LED which remains
on.
Tested button
Correspondent LED
TURN ON PLC A
ACTIVE – PLC B
STAND-BY PLC A
STAND-BY PLC A
INACTIVE PLC A
INACTIVE PLC A
TURN ON PLC B
ACTIVE – PLC A
STAND-BY PLC B
STAND-BY PLC B
INACTIVE PLC B
INACTIVE PLC B
Table 6-13. Connection between buttons and LEDs in the PX2612 button test

ALTUS Nexto NX3004 Specifications

General

Brand	ALTUS
Model	Nexto NX3004
Category	Processor
Language	English