Carbolite nanodac - Manual (Page 50)

nanodac™
MC27 –EN– 1.04
48
Ethernet/IP Display Mode (Cont.)
USING TAGS
When acting as servers, many PLCs present their data in a tag format instead of implicit data format. For
this reason, when the client is configured as ‘Client (Tags)’, 30 input and 30 output tags become available
to the user via iTools (figure 1.4.13f).
This allows tag names to be typed in, input tags 1 to 30 being associated with implicit inputs 1to 30
respectively and output tags 1 to 30 being associated with implicit outputs 1to 30 respectively.
Figure 1.4.13f iTools display showing input tags.
In the example above, the value of the parameter with the tag ‘Channel 1’ will be written to implicit input
1.
Notes:
1. Most PLCs have a data buffer limit of 500 Bytes. The total number of bytes being used is given
by the equation: Total number of data bytes = (tag length + 10) × the number of requested
tags.
2. Input data direction is always to the nanodac:
in server mode input data is written to the nanodac from the client
in client mode, input data is read by the nanodac from the server device.
3. Output data direction is always from the nanodac:
in server mode output data is written to the client from the nanodac
in client mode, output data is read by the server from the nanodac.