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18
1747-SDN DeviceNet Scanner Module Installation Instructions
Download Output Data to
the Module
Publication 1747-5.8 – July 1997
Auto Verify Failure Table
Words 220 through 223 in the M1 file are used for the auto verify
failure table. The auto verify failure table is used to verify that data
size received from the device matches the setting in the module input
data map. The module tracks auto verify failures by assigning one of
the 64 bits in the table to each device on the network. The bits are
assigned in consecutive order to consecutive device addresses
starting with node 0 at M1:S.220/0. If the bit is set, the
corresponding node has failed to verify.
Explicit Message Program Control
Words 224 through 255 are used for Explicit Message Program
Control. Use this feature to configure device parameters on your
DeviceNet network via the M0 and M1 files in the SLC processor
that is controlling these devices. This feature is described in detail on
page 20.
The SLC 500 processor writes output data to the module using two
methods:
output image table
M0 file transfer
Output Image Table
The output image table is a 32-word table for the module slot that is
updated from the processor with each program scan. The first word
(word 0) of this table is reserved for the module command register.
The remaining 31 words can be used to transfer data from the SLC
output table to the DeviceNet nodes.
Module Command Register
The module command register is located at word 0 in the output
image area for the slot. To execute a command, set the appropriate
bits in the module command word using SLC ladder instructions.
The following table describes the functionality of the command
register bits.
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