X201 to X208   Encoder for position
X15 to X20  Encoder for speed
X80 to X81  Encoder for speed
X51 to X58 PWM output
X8, X9  Nominal value output, analog
X12  TS touch trigger probe
X13  TT touch trigger probe
X23 Handwheel
X26 Ethernet data interface
X27 RS-232-C/V.24 data interface
X28 RS-422/V.11 data interface
X127 V.24/RS-232-C (only for Windows)
X128 V.11/RS-422 (only for Windows)
X141, X142  USB interface
X30  24 V reference signal for spindle
X34  24 V for "control-is-ready"
 output
X41 PLC output
X42 PLC input
X44  24 V PLC supply voltage 
X45 Keyboard unit
X46  Machine operating panel
X47 PLC expansion
X48  PLC analog input
X149 BF 150 monitor
X131 Reserved
X69 Power supply
X121, X125 Reserved 
X165 Reserved  
X74 5-V power supply
X150 Axis-specific drive release
B Signal ground
Equipment ground (YL/GN)