User Manual

Appendix

Specifications

Number of Counters 4

Module Location 1771 Series A or B I/O chassis

Maximum Count Value 0-999,999 (programmable)

BTW Processing Time (worst case)

5.5ms  binary

11ms  BCD

on a configuration change

(1.52.9ms  typical)

Maximum Input Frequency

100Hz for switch bounce; electromechanical switch (userselectable)

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 8

Maximum Output Offstate Leakage Current

less than 10µA @ 24V dc

Maximum Onstate Voltage Drop

0.05Ω 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

< 10µs turn on; < 100µs turn off

Typical: 3µs turn on; 30µs turn off

Filtering Selectable  highspeed 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