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I/O Tag or I/O Block |
Device (only for Elipse E3, Elipse Power, or Elipse Water) |
Type of CPU |
Item (only for Elipse E3, Elipse Power, or Elipse Water) |
Address identifier of a PLC |
N1 or B1 |
Number of a PLC Number, only if using a GEFANUC.ID file |
N2 or B2 |
Type of memory. For more information, please check table Types of Memories |
N3 or B3 |
Address of the position to read, starting at 1 (one) |
N4 or B4 |
Not used |
Use a PLC Tag to perform a reading or writing to a single memory position of a PLC defined by the address of the N3 parameter.
To perform a reading or writing to multiple memory positions of a PLC, use a Block Tag with the number of Elements resized to handle n sequential registers, in which each Element of this Block Tag corresponds to a memory position, starting at the address defined in the B3 parameter.
The maximum size of a Block Tag is limited to a set of up to 100 Elements, one value for every memory register. For data types in DWord and Float format, the maximum size of a Block Tag is limited to a set of up to 50 Elements, one value for every two memory registers.
The Device parameter indicates the type of CPU used by a PLC. The accepted values for this parameter are described on the next table.
Available values for the Device parameter
Value |
Description |
|---|---|
90-30 |
PLCs from 90-30 Series |
90-70 |
PLCs from 90-70 Series |
The Item parameter indicates the identifier address of a PLC. The value of this identifier can have a maximum of 6 (six) or 7 (seven) characters, according to the next table.
Available values for the Item parameter
Value |
Description |
|---|---|
Identifier with a maximum of 6 (six) characters in ASCII format (characters between '0' and '9' and between 'A' and 'F' uppercase) |
PLCs from 90-30 Series |
Identifier with a maximum of 7 (seven) characters in ASCII format (any characters) |
PLCs from 90-70 Series |
There are still fixed instructions for the Item parameter that can perform the operations described on the next table.
Available instructions for the Item parameter
Instruction |
Description |
|---|---|
AnySingleDevice |
Used only for local 1:1 communication, with a generic addressing to receive a response from any Slave identifier |
Broadcast |
Used only to perform a general writing to all existing Slaves on a network. This broadcast addressing cannot be used to perform readings from PLCs |
If an application does not support the Device and Item parameters, users can use the N1 parameter of PLC Tags or the B1 parameter of Block Tags linked to an external text file named GEFANUC.ID, which contains a list to identify the type of CPU and the identifier address of all PLCs. For more information, please check topic Configuring a GEFANUC.ID File.
NOTE |
Configuration using a GEFANUC.ID file can also be used in Elipse E3, Elipse Power, or Elipse Water applications to keep compatibility with older applications. To do so, leave the Device and Item parameters blank or empty, so that the N1 or B1 parameter linked to this GEFANUC.ID file are used. |