Overview

Specifications

Module 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 Specifications

• Voltage: 5V or 12-24V (user-selectable)
• Current: Typically 7mA @ 5V; 7.0 to 15.0mA @ 12-24V
• Minimum Input Current: 4mA

Output Specifications

• 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 the 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: Belden 9182 or equivalent
• Category: 21
• Length: 250 feet (76.2m)

Output Conductors

• Wire Size: 14 gauge stranded (max.)
• Insulation: 3/64 inch (max.)
• Category: 11

Fuse: 2AG 3A fuse (Littelfuse 225003)

Environmental Conditions

• Operating Temperature: 0 to 60°C (32 to 140°F)
• Storage Temperature: -40 to 85°C (-40 to 185°F)
• Relative Humidity: 5 to 95% (without condensation)

Keying

• Between 24 and 26
• Between 28 and 30

Field Wiring Arm

• Type: 40-terminal cat. no. 1771-WN
• Wiring Arm Screw Torque: 7-9 inch-pounds