The compact CPU 1211C has:

• 3 device versions with different power supply and control voltages.
• Integrated power supply either as wide-range AC or DC power supply (85 to 264 V AC or 24 V DC)
• Integrated 24 V encoder/load current supply:
  For direct connection of sensors and encoders. With 300 mA output current also for use as load power supply.
• 6 integrated digital inputs 24 V DC (current sinking/current sourcing (IEC type 1 current sinking)).
• 4 integrated digital outputs, either 24 V DC or relay.
• 2 integrated analog inputs 0 to 10 V.
• 2 pulse outputs (PTO) with a frequency of up to 100 kHz.
• Pulse-width modulated outputs (PWM) with a frequency of up to 100 kHz.
• Integrated Ethernet interface (TCP/IP native, ISO-on-TCP)
• 3 fast counters (100 kHz), with parameterizable enable and reset inputs, can be used simultaneously as up and down counters with separate inputs or for connecting incremental encoders.
• Expansion by additional communication interfaces, e.g. RS485 or RS232
• Expansion by analog or digital signals directly on the CPU via signal board (with retention of CPU mounting dimensions)
• Optional memory expansion (SIMATIC Memory Card)
• PID controller with auto-tuning functionality
• Integral real-time clock
• Interrupt inputs:
  For extremely fast response to rising or falling edges of process signals.
• Removable terminals on all modules
• Simulator (optional):
  For simulating the integrated inputs and for testing the user program.