On an SMP-400 system, a write/read error occurred while writing to or reading from the A/D multiplexor register on the TempComp board. The register is internal to U18.
For more information, see "MP Error Codes".
What you should do:
Note the error data that is displayed on the SMP-400 diagnostic LED.
If the error reoccurs, contact your Giddings & Lewis service representative.