Rockwell Automation 198 Series C Modular DeviceNet Starter Auxiliary User Manual - Manual (Page 29)

Operation 3-8
Publication 198-UM002A-EN-P December 2001
Choosing the I/O Assembly Data Format
Consumed Assemblies (sometimes referred to as Output Assemblies) define the format of
I/O message data that is consumed by the MDSA. The MDSA generally consumes I/O
messages to command the state of its outputs.
Choosing the size and format of the I/O data that is consumed by an MDSA is done by
choosing a Consumed Assembly instance number. This instance number is written to the
Consumed IO Assy parameter (parameter 34 in the Cat. No. 198-DN; parameter 24 in the Cat.
No. 198-DNG). Refer to Appendix on page A-1 to determine which Consumed Assembly
instance to select. The different instances/formats allow flexibility for different systems. The
screen below shows the Consumed IO Assy parameter in the parameter list of a Cat. No.
198-DNG module.
After the Consumed IO Assembly has been chosen and downloaded to the MDSA, select $OO
and 8SORDG IURP 'HYLFH. This will update the I/O Consumed Size parameter value
(parameter 48 or 38). Record this value to be used later in the Scanner I/O mapping.
Produced Assemblies (sometimes referred to as Input Assemblies) define the format of the
I/O message data that is produced by the MDSA. The MDSA generally produces I/O
messages that contain the fault status of the MDSA, and the state of the MDSA’s inputs.
Choosing the size and format of the I/O data that is produced by an MDSA is done by
choosing a Produced Assembly instance number. This instance number is written to the
Produced IO Assy parameter (parameter 35 in the Cat. No. 198-DN; parameter 25 in the Cat.
No. 198-DNG). Refer to Appendix on page A-1 to determine which Produced Assembly
instance to select. The different instances/formats allow flexibility for different systems. The
IMPORTANT
The Consumed IO Assy parameter value can not be changed while the
MDSA is online with a scanner. Any attempts to change the value of this
parameter while online with a scanner will result in the error message
“Object State Conflict”.