Siemens 353 User Manual page 2

IMPORTANT
Refer to this manual, UM353-1B, to install, configure, operate, or service a Design Level
"B" Siemens 353 Process Automation Controller.
Refer to UM353-1 to install, configure, operate, or service a Design Level "A" Siemens
or Moore Products Co. 353 Process Automation Controller.
Refer to the controller nameplate and the Model Designation and Specifications section
of the manual for the Design Level character. The Design Level is specified by the next
to last character in the model designation.