Rockwell Automation Publication 1560F-UM001A-EN-P - June 2019 139
Communications Chapter 7
Loss of Communication
with DPI Device
An "Exp. Removed" fault indicates that a device was improperly removed. There
is a Fault code determined by port number.
DPI provides a separate Exp. fault for each port. This fault can be generated
directly by the peripheral and is separate from the Exp. Removed fault (device
specific).
Default Input/Output
Communication
Configuration
The default configuration for I/O communication is 4 bytes in and 4 bytes out
(TX = 4 bytes, RX = 4 bytes). The total size may very when used with a
communication card. The default configuration is arranged according to the
following table.
Table 48 - Default Configuration
Variable Input/Output Configuration
The SMC-50 control module supports 32-bit Data Links. Therefore, you can
configure the device to return additional information. The I/O message size
depends on how many DataLinks are enabled. The following table summarizes
the I/O data sizes.
IMPORTANT • The Logic Mask must be set to 0 or the "REMOVE HIM" key is depressed
via the HIM controller screen (see Chapter 6
) before you disconnect the
HIM from the SMC-50 control module. If not, the unit will fault on a “Exp.
Removed”.
• The Logic Mask Active, Parameter 149, is a read-only parameter that
shows the logic mask actually in use at any given time. It typically
follows the Logic Mask, Parameter 148, except in some application
environments where network communication is in use.
Word Produced Data (Status) Consumed Data (Control)
0 Logic Status Logic Command
1 Feedback
(1)
(1) The feedback word is always Ave Current.
Reference
(2)
(2) The reference word is not used with the SMC-50 control module, however the space must be reserved.
TIP The total data size produced or consumed may vary, depending on the
communication card being used. For more information, see the user manual
of the specific communication card being used with the SMC-50 control
module.
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