Allen-Bradley SLC 500 Series User Manual

Publication 1747-RM001G-EN-P - November 2008
14-2 SLC Passthru Communications
DeviceNet Passthru
DeviceNet passthru allows the SLC processor system to act as a bridge
between the channel 0 or channel 1 network, and the DeviceNet network
supported by the 1747-SDN DeviceNet scanner module. This allows personal
computers on Ethernet, DH+, DH-485 or DF1 networks to upload or
download applications to devices such as PanelView operator terminals and
power monitors on the DeviceNet network.
The minimum firmware revision level of the 1747-SDN that supports passthru
is 4.015, and the minimum RSLinx revision with a 1747-SDN passthru driver
(1747-SDNPT) is version 2.00. For 1747-SDN firmware revisions from 4.015
to 5.001, the module M0/M1 file size must be configured offline by RSLogix
500 to be a length of 361 (words) in order for passthru to work. For
1747-SDN firmware revisions 6.002 and higher, the module M0/M1 file size
must be set to a length of 395 (words) in order for passthru to work. This
M-file increase accommodates larger passthru messages, which now allows
DeviceNet PanelView applications to successfully download. This also
requires an enhanced 1747-SDNPT passthru driver in RSLinx version 2.31, or
higher, which will adjust the passthru packet size based on the SDN firmware
revision level.
Channel-to-channel
Passthru
SLC 5/03, 5/04 and 5/05 processors have two communication channels, 0
and 1, allowing the processor to be connected to two separate networks.
Channel-to-channel passthru allows devices connected on one of the networks
to communicate with devices on the other network using the SLC processor as
a communications bridge. When passthru is enabled, this communications
bridging occurs whether the processor is in Program mode or Run mode. In
Run mode, the processor services passthru communications along with other
IMPORTANT
Remote I/O passthru uses buffer number 32 in the
M0 and M1 files of the remote I/O scanner module.
Avoid using these buffers for block transfer
read/write instructions if you intend to use the
remote I/O passthru capability.
TIP
DeviceNet passthru is recommended for an
occasional upload, download, or the configuration of
one parameter at a time; not a complete network
startup. This capability is not a replacement for a
dedicated DeviceNet computer interface such as a
1770-KFD, 1784-PCD, or 1784-PCID.

Allen-Bradley SLC 500 Series Specifications

General

Brand	Allen-Bradley
Model	SLC 500 Series
Category	Controller
Language	English