8020-SCP-522

About the 8020-SCP-522

8020-SCP-522 is a Model 500, 4K Processor with RAM that is manufactured by Square D. CPU/LI errors on the processor fall into the 30000-32700 range. The second and third number can be replaced by 00 to 27. 

• 00 is a status register read/write parity error. 

• 01 is an image RAM read/write parity error. 

• 02 is an internal register data error. 

• 03 is an illegal PROM format. 

• 04 is an illegal opcode encountered in RUN.

•  05 is a bus error signal error. 

• 06 is a software watchdog error. 

• 07 and 08 are not used.

•  09 is a user memory read/write parity error. 

• 10 means there is illegal data in the user memory. 

• 11 means that the PROM memory is corrupted.

•  12 is an illegal addressing map code.

•  13 means that the transmission error exceeds tolerance.

•  14 means that there is a loss of transmission. 

• 15 means that there are more external I/O registers assigned than the module can handle.

•  16 means that there are too many registers assigned to the drop.

•  17 means that the module is addressing more than 8 drops per channel.

•  18 means that the addressing number of channels exceeded the module capabilities.

•  19 means that there is an addressing map checksum error.

•  20 means that there is a bus error (watchdog timeout).

•  21 is a BPU diagnostic error.

•  22 means that the parity circuit is non-functional.

•  23 means that there is a clear line error. 

• 24 is an executive scratch RAM error. 

• 25 is a watchdog tolerance error. 

• 26 is a hardware diagnostic error.

•  27 means that the module is inactive.