1747-6.5.5, SL 500 DeviceNet Scanner Module User Manual

1-8 Before You Begin
What 1747-SDN Module
Data Tables Are and What
They Do
Publication 1747-6.5.5 - August 2000
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