EGW1-IA3-MB-DF1 – Modbus TCP a DF1 User’s Manual
Exemys
www.exemys.com
Rev. 1
28
E. Configuring FlexLogix and ControlLogix PLCs
Time ago, Allen Bradley came out with some modifications about the way that newer PLCs exchange
data. In the new approach, the PLC defines tags to map data, rather than Files. At the moment of this
publication, those PLCs belong to the FlexLogix and ControlLogix family. The new commands are not
compatible with EGW1-MB-DF1, yet. However, AB provides downwards-compatibility with the old
command set. Recall that EGW1-MB-DF1 only uses the
Protected typed logical read with three address
fields
and
Protected typed logical write with three address fields
DF1 commands and it does not count on
specific PLC information, such as processor, model or firmware version.
Here we provide some basic information to activate the downward compatibility feature with RSLogix
5000.
To map an address:
1.
In RSLogix 5000 software, open the project file for the controller whose data you
want to access
2.
From the Logic menu, select Map PLC/SLC Messages
3.
The screen shown will be used to provide the actual mapping between an already
defined tag and the File Number you choose to make public to EGW1-MB-DF1.
Complete the information required as an SLC mapping. (Choose an appropriate
File Number). The tags must be controller-scoped (global).
4.
Click OK
If you want to map many data into one File, you can define a tag as an array.
