A - specifications, Specifications, Appendix – Rockwell Automation 1771-VHSC , D17716.5.74 Very High S User Manual

Page 53

Appendix

Specifications

Number of Counters

Module Location

1771 Series A or B I/O chassis

Maximum Count Value

0-999,999 (programmable)

BTW Processing Time (worst case)

5.5ms Ć binary

11ms Ć BCD

on a configuration change

(1.5Ć2.9ms Ċ typical)

Maximum Input Frequency

100Hz for switch bounce; electromechanical switch (userĆselectable)

250kHz in encoder modes (2-channel quadrature)

500kHz in period/rate, rate/measurement and continuous/rate modes

1MHz in counter modes (single channel)

Inputs per Counter

3 - A, B, Gate/reset

Input Voltage

5V or 12-24V (user selectable)

Input Current

Typically 7mA @ 5V; 7.0 to 15.0mA @ 12-24V

Minimum Input Current

4mA

Number of Outputs

Maximum Output OffĆstate Leakage Current less than 10

A @ 24V dc

Maximum OnĆstate Voltage Drop

0.05

Ω

x current

Output Control

Any number of outputs are assignable to any of 4 counter channels.

One turn-on" preset value and one turn-off" preset per output.

Output Voltage

5 to 24V dc, customer supplied

Output Current

2A per channel sourced out of module. All outputs

can be on simultaneously without derating.

Output Switching Time

< 10

s turn on; < 100

s turn off

Typical: 3

s turn on; 30

s turn off

Filtering

Selectable Ċ highĆspeed or normal (normal = below 100Hz)

Backplane Current

650mA

Isolation Voltage

1500V between input and backplane

1500V between output and backplane

300V between isolated channels

Power Dissipation

13 Watts (max); 2 Watts (min)

Thermal Dissipation

54.2 BTU/hr (max); 6.8 BTU/hr (min)

Input Conductors

Wire Size