Siemens Error Code P499 Explanation
The P499 error code is used to show any errors that are generated by the connected PLC. The
P499 error message includes a four digit hexadecimal value displayed at the end of the message.
This value can be looked up in the specific PLC’s error tables to determine the cause of the error.
The possible PLC generated error codes for the Siemens PPI communication protocols
breakdown into a four digit hexadecimal value as shown in the following diagram.
Siemens Error Code P499 Message Example:
01100000000000
600
hex
P499 Error Code Message
Displayed Hexadecimal Value
Siemens PPI Error Code P499 Breakdown
16-bit
Word
Example of a Siemens PPI error
for a “Address out of range.” error.
0123456789101112131415
Main response
code
Relay
error flag
Sub response
code
00
0