Extended I/O

The SM-I/O Lite has the following terminals:

1. 0V
2. ±10V / 4-20mA Analogue input
3. 0-10V / 4-20mA Analogue output
4. +24V
5. Digital input
6. Digital input
7. Digital input / Encoder B
8. Encoder B\
9. Encoder A
10. Encoder A\
11. 0V
12. Encoder +5V
13. Relay
14. Relay

If Encoder feedback is required, there are only 2 digital inputs available, otherwise 3 digital inputs are available. One digital output as relay terminals.

Update Rate: 4ms ~ 18ms

Analogue I/O

Voltage input specification:

Range: -10V – +10V

Update Rate: 4ms ~ 18ms

For positive input voltage:
-Input impedance: 100k
-Accuracy: 2%

For negative input voltage:
-Input impedance: 18k
-Accuracy: 4%

Resolution:
-Programmable 10 bit plus sign or 11 bit plus sign for precision reference

Current Output specification:

Range: 4 – 20mA (short circuit proof)
Update Rate: 4ms ~ 18ms
Resolution: 0.4%
Accuracy: 5%

Encoder Input specification

• Differential inputs up to 12V
  
  
• Will count non differential inputs with connections to just A and B
  
  
• Will count F and D signal (F on A, and D on B or B\ depending on polarity of D)
  
  
• Maximum input frequency 55kHz Quadrature or 110kHz F & D
  
  
• Encoder +5V supply will be at 5.15V to compensate for cable voltage drops, with 250mA short circuit protection
  
  
• Update Rate: 4ms ~ 18ms (depending on the total I/O used)

The encoder feedback option is low cost and is not a true Quadrature decoder/counter. Operation close to zero speed could lead to miscounting, however an accurate indication of speed and direction will be possible, and measurement of distance will be possible providing there is no operation around zero speed