SNMP line

The SNMP line maps SNMP (Simple Network Management Protocol) variables from an SG4 PLC to PVI variable objects.

The SNMP line is intended mainly for commissioning a new PLC via the Ethernet interface. SNMP variables can be used to make or call up settings such as host name, IP address, node number, etc..

The following topics are covered in this section:

•SNMP process objects

•SNMP access types

•SNMP event types

SNMP process objects

A line object, a device object, and a variable object are all needed to access a global SNMP variable. Local SNMP variables also require a station object.

Process objects of the ADI line:

Name	Type	Connection	Usage
Line object	Line	"LNSNMP"	SNMP line.
Device object	Device	"SNMP"	SNMP device.
Station object	Station	MAC address	Specifies a particular PLC.
CPU object	CPU		Can be specified, but not required.
Module object	Modules		Can be specified, but not required.
Task object	Task		Can be specified, but not required.
Variable object	Pvar	Variable name	SNMP variable.

Allowed object structure for SNMP process objects:

pvilnsnmpobjectstructure

SNMP access types

The following table shows an overview of all access types which are regulated via a line. All access types not listed here as well as access types to the PVI base object are executed by PVI Manager and therefore work independently of the line being used. The corresponding process object type is listed in the "Type" column.

Access types	Type	Special features
POBJ_ACC_VERSION	Line	Line object: Version of the line DLL. Device object: Version of the B&R SNMP DLL.
POBJ_ACC_LIST_EXTERN	Line, Device, Station	Line object: SNMP device. Device object: List of all PLC MAC addresses that can be identified on the network, as well as all global SNMP variables. Station Object: List of local SNMP variables *)
POBJ_ACC_DATA	Pvar	Read/write data from an SNMP variable.
POBJ_ACC_STATUS	Pvar	Not supported
POBJ_ACC_TYPE_EXTERN	Pvar	Data format of an SNMP variable (as defined by the line).
POBJ_ACC_UPLOAD		Not supported
POBJ_ACC_DOWNLOAD		Not supported
POBJ_ACC_DATE_TIME		Not supported
POBJ_ACC_MEM_DELETE		Not supported
POBJ_ACC_MEM_INFO		Not supported
POBJ_ACC_MOD_TYPE		Not supported
POBJ_ACC_UPLOAD_STM		Not supported
POBJ_ACC_DOWNLOAD_STM		Not supported
POBJ_ACC_MOD_DATA		Not supported
POBJ_ACC_MOD_DELETE		Not supported
POBJ_ACC_LIST_STATION	Device	Device object: List of all PLC MAC addresses that can be identified on the network.
POBJ_ACC_LIST_CPU		Not supported
POBJ_ACC_LIST_MODULE		Not supported
POBJ_ACC_LIST_TASK		Not supported
POBJ_ACC_LIST_PVAR	Device, Station	Device object: List of global SNMP variables. Station Object: List of local SNMP variables *)
POBJ_ACC_CPU_INFO		Not supported
Access type > 255		Not supported

*) The list contains the possible variables for a PLC. Whether or not these variables are actually supported depends on the addressed PLC.

SNMP event types

The following table shows an overview of all event types which can be generated from a line. All event types which are not listed are generated by PVI Manager and therefore work independently of the line being used.

Event types	Special features
POBJ_EVENT_STATUS	Not supported
POBJ_EVENT_PROCEEDING	Not supported
Event type > 255	Not supported