ALTUS Nexto Series User Manual

5. CONFIGURATION
CPU operational state
STOP RUN
Protocol Type
After
down-
load,
before
appli-
cation
starts
After the
applica-
tion goes
to STOP
(PAUSE)
After an
exception
Non re-
dundant
or Active
Redundant
in Stand-
by
After a
break-
point in
MainPrg
SOE (DNP3) Outstation
IEC 60870-5-104 Server
EtherCAT Master NA
OPC DA Server
OPC UA Server
SNTP Client
HTTP Server
SNMP Agent
EtherNet/IP Scanner NA
Adapter NA
Table 69: Protocol Behavior x CPU State
Notes:
Symbol : Protocol remains active and operating normally.
Symbol : Protocol is disabled.
EtherCAT: The tests were performed using MainTask as EtherCAT bus cycle task. If another task is used, the protocol
will remain active when there’s a breakpoint in MainPrg. For further information on EtherCAT protocol, consult MasterTool
IEC XE User Manual MT8500 - MU299609.
MODBUS Symbol Slave/Server: To keep the protocol communicating when the CPU isn’t in RUN or after a breakpoint,
it’s need to check the option “Keep the communication running on CPU stop”.
5.5.2. Double Points
The input and output double digital points representation is done through a special data type called DBP (defined in the
LibDataTypes library). This type consist basically in a structure of two BOOL type elements, called OFF and ON (equivalent
to TRIP and CLOSE respectively).
In Nexto, variables of this type cannot be associated to digital input and output modules, being necessary the single digital
points mapping, BOOL type, and the treatment by application to conversion in double points.
To further information about the double points mapping in the input and output digital modules check the IEC 60870-5-104
Server section.
5.5.3. CPU’s Events Queue
The CPU owns an events queue of type FIFO (First In, First Out) used to store temporarily the events related to communi-
cation points until they are moved to their final destiny.
All communication points events generated in the CPU are directed and stored in CPU’s queue. This queue has the
following features:
Size: 1000 events
Retentivity : it is not retentive
Overflow policy: keep the newests
97

ALTUS Nexto Series Specifications

General

Brand	ALTUS
Model	Nexto Series
Category	Computer Hardware
Language	English