Overview
The VHSC module is designed for high-speed counting in industrial applications. It functions as an intelligent block transfer I/O module, allowing seamless signal interfacing with any Allen-Bradley programmable controller that supports block transfer. Through block transfer programming, the module's status data is efficiently transferred from its memory to a specified location in the processor's data table. Additionally, configuration words are transferred from the processor's data table back to the module's memory, ensuring smooth and precise operation.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
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