The 4DP7APXAD211 is the optional A/D converter card for the High Level PIU, used when the HL PIU scans analog inputs.

This card can be used in any release of the HL PIU.

This A/D converter converts the analog signal into a 12-bit digital signal, which is passed in parallel to the microprocessor. The analog input cards which require the use of this A/D converter card are the following:

• 4DP7APXIA111
• 4DP7APXIA122
• 4DP7APXIA211
• 4DP7APXIA222
• 4DP7APXIA311
• 4DP7APXIA322
• 4DP7APXIA411
• 4DP7APXIA422

The 4DP7APXAD211 Analog to Digital (A/D) converter is factory calibrated. If board has problems it should be swapped with a factory calibrated board. Manufacture does not recommend recalibrating the A/D board, but in emergency situations calibration can be done.