Products Description
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Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Allen-Bradley 1771-VHSC Very High Speed Counter Module |
| Product Type | PLC High-Speed Counter Module |
| Manufacturer | Rockwell Automation / Allen-Bradley |
| Series | PLC-5 (1771 Series) |
| Number of Counters | 4 independent counters |
| Input Channels | 12 digital inputs (A, B, Z per counter) |
| Input Types | Encoder, counter, period/rate modes |
| Maximum Input Frequency | Up to 1 MHz (single-channel mode) |
| Quadrature Frequency | Up to 250–500 kHz (encoder mode) |
| Count Range | 0 to 999,999 (programmable) |
| Output Channels | 8 digital outputs |
| Output Type | 5–24 V DC sourcing outputs (grouped) |
| Backplane Current | 0.65 A @ 5 V DC |
| Module Update Time | ~100 µs |
| Input Voltage Range | 5 V DC or 12–24 V DC (selectable) |
| Wiring Arm | 1771-WN |
| I/O Connection Hardware | 1771-RTP1 |
| Slot Requirement | Single-slot module |
| Operating Temperature | 0°C to 60°C |
| Dimensions (L × W × H) | 115 mm × 160 mm × 317 mm |
| Weight | 1.0 kg (approx. 2.2 lbs) |
| Lifecycle Status | Discontinued (PLC-5 legacy module) |
FAQ
FAQ
Q1. What is the 1771-VHSC used for?
It is used for high-speed pulse counting, encoder feedback, and precise motion or position tracking in PLC-5 systems.
Q2. How many counters does it have?
It provides 4 independent high-speed counters.
Q3. What is the maximum counting speed?
Up to 1 MHz in single-channel counter mode.
Q4. What types of inputs does it support?
It supports encoder signals (A/B/Z), pulse generators, and proximity switches.
Q5. Does it require external power?
No, it is powered through the PLC backplane.
Q6. What is the resolution of counting?
It supports programmable counts up to 999,999.
Q7. What is the response speed?
It updates every ~100 microseconds for high-speed processing.
Q8. What is its physical size and weight?
Approximately 115 × 160 × 317 mm and about 1.0 kg (2.2 lbs).
Tags
Packing & Delivery
We will use wear-resistant cartons to seal the boxes, and take photos for your confirmation before sealing. We will pack the boxes only after confirmation.
For express delivery, we will use DHL, UPS, TNT, FedEx and EMS.
Please rest assured that we have a deep cooperation with express delivery companies and can ensure that your goods are delivered to you in good condition.
