Allen-Bradley SLC 500 DeviceNet, User Manual, Page: 24 / 139

Publication 1747-6.5.5 - August 2000
1-8 Before You Begin
What 1747-SDN Module
Data Tables Are and What
They Do
To manage the flow of data between your SLC 500 processor and the
network devices, the 1747-SDN module uses the following data tables:
•
Scanner Configuration Table (SCT)
•
Scanlist Table (SLT)
•
Device Input Data Table
•
Device Output Data Table
•
Device Active Table
•
Device Failure Table
•
Client/Server Transaction Tables
You can configure the first two of these data tables through
RSNetWorx for DeviceNet software:
•
Scanner Configuration Table (SCT)
•
Scanlist Table (SLT)
These two tables are stored in the 1747-SDN module’s non-volatile
memory and used to construct all other data tables.
The Scanner Configuration Table (SCT)
The SCT controls basic information your 1747-SDN module needs to
function on your DeviceNet network. It tells your 1747-SDN module:
•
if it can transmit and receive input and output data
•
how long it waits after each scan before it scans the devices
again
•
when to send out its poll messages