Overview
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | APM11 |
| Brand | Yokogawa |
| Origin | Japan |
| Product Type | Pulse Input Module |
| System Compatibility | CENTUM CS 3000 and CENTUM CS 1000 |
| Input Signal | Contact ON/OFF, voltage pulse, current pulse |
| Input Type | 2-wire type and 3-wire type pulse input |
| Input Frequency | 0 to 10 kHz |
| Data Update Period | 10 ms |
| Minimum Input Pulse Width | 40 us or more |
| Contact Input Detection Level | Open: 100 k ohm or more; Closed: 200 ohm or less |
| Contact Capacity | 15 VDC, 15 mA or more at 12 V power supply; 30 VDC, 30 mA or more at 24 V power supply |
| Voltage Pulse Input Level | VH: 3 to 24 VDC; VL: -1 to 8 V |
| DC Swing | VH – VL >= 3 V |
| Signal Source Resistance | 1 k ohm or less |
| Shunt Resistance | Selectable: 200 ohm / 510 ohm / 1000 ohm / OFF |
| Pull-up Resistance | 68 k ohm (12 V or 24 V) |
| Transmitter Power Supply | 12 VDC +/-10%, 35 mA or less; 24 VDC +/-10%, 24 mA or less |
| Output Signal | Transistor contact (open collector), 30 VDC, 30 mA or less |
| Power Consumption | 400 mA or less at 5.0 VDC |
| Signal Isolation | Input signals isolated between systems; withstand voltage 1500 VAC/min |
| Installation Method | Installed in I/O Module Nest |
| Connection Method | Connected to I/O Module Nest terminal with M4 screws |
| Weight | 0.1 kg |
| Dimensions | 7.6 cm x 0.0 cm x 17.8 cm |
| Operating Temp | Not specified in available documentation |
Yokogawa DCS Pulse Signal Processing and Isolation
The Yokogawa APM11 receives discrete pulse signals from field devices and converts them into digital data for CENTUM CS 3000 and CENTUM CS 1000 control processing. The module supports contact input, voltage pulse input, and current pulse input configurations.
In addition, the APM11 provides transmitter power supply capability for two-wire field instruments. The module supports 12 VDC and 24 VDC transmitter excitation with current limitation functions. Furthermore, the input circuits maintain system isolation with a 1500 VAC/min withstand voltage specification.
The APM11 follows Yokogawa DCS I/O architecture requirements and uses channel signal conditioning to process pulse frequency data with a 10 ms update period. The module supports input frequencies up to 10 kHz for rotating equipment, flow measurement, and other pulse-based field applications.
Frequently Asked Questions (FAQ)
Q: What input signals does the Yokogawa APM11 support?
A: The APM11 supports contact ON/OFF signals, voltage pulses, and current pulse signals. It also supports two-wire transmitters by providing transmitter power supply output.
Q: Can the APM11 process high-speed pulse signals?
A: Yes. The module accepts input frequencies from 0 to 10 kHz and detects minimum pulse widths of 40 us or longer.
Q: Does the APM11 provide electrical isolation?
A: Yes. The module isolates input signals between systems and provides an isolation withstand voltage of 1500 VAC/min.
Field Installation Guidelines
- Install the APM11 module in the designated Yokogawa I/O Module Nest according to the CENTUM system hardware configuration.
- Connect field wiring to the I/O Module Nest terminal using the specified M4 screw connection points.
- Separate pulse signal wiring from high-voltage power cables to reduce electrical interference.
- Use appropriate shielding methods for pulse signal cables and connect cable shields according to the plant grounding practice.
- Confirm the input signal type through software configuration before commissioning the module.
- Verify transmitter power supply wiring polarity before applying field power.
- Check pulse source voltage levels and signal frequency range before system startup.
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