The RP-C-16B-F-230V model has 16 I/O points and the controller is equipped with 30 fixed screw terminals.
Recommended screw tightening torque: 0.56 to 0.79 Nm (5 to 7 lbf.in)
    The 30 screw terminals are used as follows:
Two screw terminals for the power input
One screw terminal for protective earth ground
Two screw terminals for the 24 VAC output terminals 4 and 5
Six screw terminals for the four solid-state relay (SSR) outputs
Four screw terminals for the three relay outputs
Three screw terminals for the high power relay output
12 screw terminals for the eight universal inputs/outputs of type Ub
| 
 Terminal number  | 
 Designation  | 
 Usage  | 
| 
 Power input  | 
 
  | 
 
  | 
| 
 1  | 
 L  | 
 Line (L) lead, 230 VAC, 50/60 Hz, 65 VA  | 
| 
 2  | 
 N  | 
 Neutral (N) lead, 230 VAC, 50/60 Hz, 65 VA  | 
| 
 3  | 
 
     | 
 Protective earth ground  | 
| 
 24 VAC output  | 
 
  | 
 
  | 
| 
 4  | 
 24 VAC Out  | 
 24 VAC, 19 VA, isolated output For more information, see 24 VAC Output on RP-C 230 V Controller Models .  | 
| 
 5  | 
 24 VAC Out  | 
 24 VAC, 19 VA, isolated output For more information, see 24 VAC Output on RP-C 230 V Controller Models .  | 
| 
 Solid-state relay (SSR) outputs  | 
 
  | 
 
  | 
| 
 6  | 
 DO1  | 
 SSR output  | 
| 
 7  | 
 COM1  | 
 Common connection for DO1 and DO2 The COM terminal can be connected to 0 to 24 VAC or -30 VDC to +30 VDC.  | 
| 
 8  | 
 DO2  | 
 SSR output  | 
| 
 9  | 
 DO3  | 
 SSR output  | 
| 
 10  | 
 COM2  | 
 Common connection for DO3 and DO4 The COM terminal can be connected to 0 to 24 VAC or -30 VDC to +30 VDC.  | 
| 
 11  | 
 DO4  | 
 SSR output  | 
| 
 Relay outputs  | 
 
  | 
 
  | 
| 
 12  | 
 COM3  | 
 Common connection for DO1, DO2, and DO3  | 
| 
 13  | 
 DO1  | 
 Relay output, type Form A  | 
| 
 14  | 
 DO2  | 
 Relay output, type Form A  | 
| 
 15  | 
 DO3  | 
 Relay output, type Form A  | 
| 
 High power relay outputs  | 
 
  | 
 
  | 
| 
 16  | 
 NC  | 
 Normally Closed terminal. High power relay output, type Form C.  | 
| 
 17  | 
 DO4  | 
 Common terminal. High power relay output, type Form C.  | 
| 
 18  | 
 NO  | 
 Normally Open terminal. High power relay output, type Form C.  | 
| 
 Universal inputs/outputs  | 
 
  | 
 
  | 
| 
 19  | 
 Ub1  | 
 Universal input/output, type Ub  | 
| 
 20  | 
 RET  | 
 Internally connected to all RET terminals  | 
| 
 21  | 
 Ub2  | 
 Universal input/output, type Ub  | 
| 
 22  | 
 Ub3  | 
 Universal input/output, type Ub  | 
| 
 23  | 
 RET  | 
 Internally connected to all RET terminals  | 
| 
 24  | 
 Ub4  | 
 Universal input/output, type Ub  | 
| 
 25  | 
 Ub5  | 
 Universal input/output, type Ub  | 
| 
 26  | 
 RET  | 
 Internally connected to all RET terminals  | 
| 
 27  | 
 Ub6  | 
 Universal input/output, type Ub  | 
| 
 28  | 
 Ub7  | 
 Universal input/output, type Ub  | 
| 
 29  | 
 RET  | 
 Internally connected to all RET terminals  | 
| 
 30  | 
 Ub8  | 
 Universal input/output, type Ub  |