YOKOGAWA AMM21 Digital I/O Module
The YOKOGAWA AMM21, also cataloged as the AMM21 Digital I/O Module, operates as a dedicated hardware component for combined discrete signal acquisition and digital actuation within CENTUM VP and CENTUM CS 3000 platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AMM21 |
| Brand | YOKOGAWA |
| Origin | Japan |
| Weight | 0.4 kg |
| Dimensions | Standard CENTUM VP / CS 3000 card rack footprint |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 3 W |
| Function | Digital input/output interface |
| Channel Configuration | 16 Digital Inputs / 16 Digital Outputs |
| Channel Isolation | Galvanic isolation between I/O groups |
Channel-to-Channel Isolation & DCS Field Signal Processing
The module incorporates galvanic isolation across input and output circuits to insulate internal processing buses from field-side voltage transients and ground potential differences. Individual channels feature dedicated optical and magnetic decoupling stages that suppress common-mode electrical noise. When processing discrete status feeds or driving external actuators, this isolated channel structure maintains high signal fidelity, preventing ground loop currents from propagating across the CENTUM VP backplane or affecting adjacent I/O modules.
Frequently Asked Questions
Q: Can the AMM21 module be replaced online while the control rack remains powered?
A: Yes. The module supports hot-swapping within active CENTUM VP and CENTUM CS 3000 I/O nodes, allowing replacement without powering down the rack or interrupting communications on adjacent cards.
Q: How does channel-to-channel isolation benefit field device wiring connected to the module?
A: Galvanic isolation blocks potential ground loops and limits electrical noise transmission between field sensor loops and backplane logic networks, preserving overall signal stability.
Field Installation Guidelines
Ensure that external power sources connected to field contacts and outputs are isolated prior to installing or removing the card. Align the rear connectors with the base rack guide tracks and push the module firmly until the retention latches engage fully with the backplane frame.
For signal wiring and cabinet commissioning:
- Strip individual field wire leads to 7 mm and secure them into the corresponding terminal block points.
- Route digital input sensor lines and digital output control leads in dedicated wiring channels isolated from high-voltage AC lines.
- Connect signal cable shield drain wires directly to the cabinet main copper ground busbar to maintain noise immunity.
- Verify all terminal connection screws are torqued properly to prevent high-resistance electrical connections under continuous load.
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| Delivery | Expedited, Freight, And International Shipping Available. |
| Condition | 100% New with Original Package |
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| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
| Q: Is Our Pricing Competitive? |
| A: Yes, we collaborate with over 50 countries worldwide. As a top supplier in China, we offer significant discounts based on market trends. |
| Q: What Is the Warranty Period? |
| A: All our new and original products come with a standard one-year warranty. |
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| A: We require 100% T/T (Telegraphic Transfer) payment before shipping. For items with a lead time, a 30% deposit is needed upfront, and the remaining 70% is due before shipping. If you have a representative in China, you can arrange an RMB transfer through them. |
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| A: We primarily use FedEx, DHL, UPS, and BRE for shipping. If you have an account with any of these carriers, you can handle shipping directly. We also offer free shipping to China-based freight forwarders. |
| Q: What Is Our Delivery Time? |
| A: Delivery usually takes 1-3 days after receiving the initial payment. For items with a lead time, shipping will occur according to the specified schedule. |
| Q: How Do We Package the Goods? |
| A: We ensure safe packaging with multiple layers of protection. Products are first placed in their original boxes and sealed with labels. A layer of bubble wrap is then added for collision protection during transit. Finally, the items are packed securely in durable boxes. |
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