Rockwell Automation DEVICENET 1771-SDN, Руководство пользователя, Страница: 25 / 139

Publication 1771-6.5.132 - June 2000
Before You Begin 1-9
•
exactly where in each device’s total data to find the desired data
•
the size of the input data/output data
•
exactly where to map the input or output data for your
processor to read or write
RSNetWorx Software as a
Configuration Tool
RSNetWorx for DeviceNet software is used to configure the 1771-SDN
module’s data tables. This software tool connects to the 1771-SDN
module over the DeviceNet network via a PC RS–232 interface
(1770–KFD module), or PC Card (1784-PCD, -PCID, or PCIDS).
User
Configured
Tables Data In This Table RSNetWorx Configuration
Screen
SCT • basic operation
• module parameters
• interscan delay
• background poll ratio
1771-SDN Module Configuration
SLT • device-specific
identification data Scanlist Editor (SLE)
• data transfer method
• transmit/receive data size
Edit Device I/O Parameters
• input and output data
source and destination
locations These values can be configured
automatically through the
AutoMap function or manually
through the Data Table Map.
Interscan delay is the time between
I/O scans (polled and strobed). It is
the time the 1771-SDN module will
wait between the last poll message
request and the start of the next scan
cycle.
Background poll ratio sets the
frequency of poll messages to a
device in relation to the number of
I/O scans. For example, if the ratio
is set at 10, that device will be
polled once every 10 scans.
TIP
RSNetWorx for DeviceNet software can also
communicate with the 1771-SDN module via a
ControlNet, Ethernet, or Data Highway Plus network.
See chapter 5.