GE PACSystems RX7i Reference Manual page 89

Chapter 2. CPU Features & Specifications
CPE310 versus CPU310 Performance Differences
The following differences should be considered when converting legacy applications or developing new
applications.
▪ Some exceptionally lengthy CPE backplane operations, such as MC_CamTableSelect, Data Log and
Read Event Queue functions, will take longer to complete compared to other RX3i CPU models, and
may delay backplane operations to IC695 modules.
For example, when an MC_CamTableSelect function block is executed on the PMM335 module, the
CPU's acknowledgement of the PMM355 module interrupt may be delayed. In this situation, you may
see the following fault in the I/O Fault Table, even when the interrupt has not been dropped: Error
initiating an interrupt to the CPU.
▪
Performance specifications for many features, such as power-up time, function block execution
times and I/O module sweep times have changed. For details, refer to Appendix A.
▪ The RS-232 port on the CPE310 does not provide 5Vdc power on pin 5.
CPU305 Performance Differences vs. CPE310 and Legacy RX3i CPUs
The CPE302/CPE305 exhibits the same performance differences as listed above for the CPE310.
The CPE305 supports legacy CPU310 projects that fit within 5 Mbytes of user memory. The CPE302
supports legacy CPU310 projects that fit within 2 Mbytes of user memory. The project configuration
must be changed to support any such conversion.
Because the CPE302/CPE305 has less user memory than the other RX3i CPUs, operations that involve
transferring large files could fail.
For example, depending on the number and sizes of Data Log files already stored, the Get_DL (Get Data
Log) command could fail with a C10 hex (file transfer failure occurred while sending the data log file to
the CPU) error. To correct this error
1. Upload the data logs to Machine Edition and delete the logs from the CPU.
2. Take steps to reduce the size of the log file, such as reducing the number of samples, the sample
rate, or the number of parameters logged.
78 PACSystems* RX7i, RX3i and RSTi-EP CPU Reference Manual GFK-2222AD