Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AMM21 / AMM21T |
| Brand | Yokogawa |
| Origin | Japan |
| Module Type | Analog Multiplexer Input Module |
| System Compatibility | CENTUM CS, CENTUM CS 3000, CENTUM VP |
| Input Channels | 16 channels |
| Input Signal Types | 4-20 mA DC, 0-10 V DC, Thermocouple inputs with applicable terminal unit configuration |
| Signal Processing | Analog signal multiplexing and acquisition |
| Isolation | Channel-to-system electrical isolation |
| Withstand Voltage | 1500 V AC for 1 minute |
| Accuracy | +/- 0.1% of full scale typical |
| Operating Temp | 0 deg C to 50 deg C |
| Operating Humidity | 10% to 90% RH non-condensing |
| Dimensions | Approx. 12.7 cm x 2.5 cm x 20.3 cm |
| Weight | Approx. 0.2 kg to 0.5 kg |
| Power Consumption | Not specified in available documentation |
Yokogawa DCS Signal Interface Characteristics
The AMM21T integrates with Yokogawa CENTUM architectures through analog signal multiplexing functions. It accepts multiple field inputs and routes selected channels to the control system processing path. Therefore, the module reduces individual signal wiring requirements while maintaining controlled signal transmission.
The module supports process instrumentation signals including 4-20 mA HART loop interfaces and voltage inputs when configured with compatible terminal components. Additionally, channel-to-channel isolation and input filtering functions support signal separation in industrial environments with electrical interference.
For temperature measurement applications, the AMM21T configuration can support thermocouple inputs through suitable terminal unit arrangements. Moreover, cold junction compensation (CJC) functions depend on the connected terminal configuration and system implementation.
Frequently Asked Questions
Q: How many analog input channels does the Yokogawa AMM21T support?
A: The AMM21T supports up to 16 analog input channels for multiplexed signal acquisition.
Q: Does the AMM21T directly convert all field signals into control system data?
A: The module performs analog signal multiplexing and routing. Signal conversion functions depend on the connected Yokogawa I/O architecture and terminal configuration.
Q: Can the AMM21T support 4-20 mA and voltage input signals?
A: Yes. The module supports 4-20 mA DC and 0-10 V DC input signals when installed with compatible system components.
Field Installation Guidelines
- Install the AMM21T within the specified Yokogawa I/O cabinet or card mounting assembly.
- Verify terminal unit compatibility before connecting field instruments.
- Use shielded cables for analog signal wiring to reduce electromagnetic interference.
- Connect cable shields according to Yokogawa cabinet grounding practices.
- Separate analog signal cables from high-current power wiring and switching circuits.
- Confirm input polarity and signal range before applying field power.
- Check module recognition and diagnostic status through the CENTUM engineering environment after installation.
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