Zeror.ai Error Codes Siemens 0x1220

Siemens 0x1220

Brand: SiemensModel: PLC (S7-1200 / S7-1500)Error code: 0x1220

What the Fault Means

Loss of RTC (Real-Time Clock)

Likely causes

  • Battery discharged or not present; RTC not synchronized

Solution and Safe First Checks

  1. Replace backup battery (S7-1500); configure NTP synchronization

Safety: do not work inside the panel without isolating the power; if unsure, consult a qualified technician.

Related Siemens error codes

Source: the Zeror.ai industrial fault database and Siemens technical documentation. This page is for information; on critical systems follow the manufacturer's manual and authorised service.

Siemens 0x1220 · Zeror.ai