Yokogawa AAP135-S00/K4A00 – 8-Channel Isolated Pulse Input Module

The Yokogawa AAP135-S00/K4A00 is a pulse input module. Specifically, this module receives contact ON/OFF signals, voltage pulses, and current pulses. It features isolation between the field and the system. Furthermore, isolation exists between each individual channel. Consequently, this module suits high-integrity pulse counting applications in safety and process systems.

Ordering Configuration and Model Identification

• Model: AAP135 Pulse Input Module (8-channel, Pulse count, 0 to 10 kHz, Isolated channels).

• Suffix Code -S: Standard type.

• Suffix Code 0 (First): With no explosion protection.

• Suffix Code 0 (Second): Basic type.

• Option Code /K4A00: With KS Cable Interface Adapter (Model: ATK4A-00).

• Dual-Redundancy: Supported for critical applications.

• Therefore, the Yokogawa AAP135-S00/K4A00 offers flexible configuration for pulse counting.

Input Channel Specifications

• Number of Input Channels: 8 channels total.

• Isolation Type: Isolated between channels and from system.

• Input Frequency Range: 0 to 10 kHz maximum.

• Minimum Input Pulse Width: 40 microseconds.

• Data Update Period: 2 milliseconds.

• Shunt Resistance Options: None, 200 Ω, 500 Ω, or 1000 Ω (selectable).

• Shunt Behavior: Open when power is OFF and for standby side in dual-redundant configuration.

• Pull-up Resistance: 68 kΩ (for 12 V DC or 24 V DC).

• Filter: Configurable for chattering elimination.

• Thus, the AAP135-S00/K4A00 captures high-speed pulses with programmable input conditioning.

Input Signal Types and Wiring

• 2-Wire Type Signals: Contact ON/OFF, voltage pulse, current pulse.

• 2-Wire Transmitter Power: Possible to supply transmitter power.

• 3-Wire Type Signals: Power-supply-type voltage pulse.

• Current Input Conversion: Current input is converted to voltage internally.

• Signal Source Resistance: 1 kΩ or less required.

• Flexibility: Supports multiple field device types without external converters.

• Consequently, the Yokogawa AAP135-S00/K4A00 reduces external wiring complexity.

Contact Input Specifications

• Open Level: 100 kΩ or larger.

• Close Level: 200 Ω or less.

• Contact Capacity (12V DC Supply): 15 V DC, 15 mA or higher.

• Contact Capacity (24V DC Supply): 30 V DC, 30 mA or higher.

• Application: Relay contacts, transistor contacts, limit switches.

• Therefore, the AAP135-S00/K4A00 reads dry contact closures reliably.

Voltage and Current Pulse Input Specifications

• VH (High Level) Range: 3 to 24 V DC.

• VL (Low Level) Range: -1 to 8 V DC.

• VH-VL Swing Value: 3 V or higher minimum.

• Signal Source Resistance: 1 kΩ or less.

• Current Input: Converted to voltage internally.

• Shunt Resistance: Selectable per channel (none/200/500/1000 Ω).

• Thus, the Yokogawa AAP135-S00/K4A00 accepts a wide range of pulse-generating devices.

Transmitter Power Supply

• Selectable Voltage: 24 V DC or 12 V DC.

• Limiter Value (12V DC ±10%): 40 mA maximum.

• Limiter Value (24V DC ±10%): 30 mA maximum.

• Purpose: Powers 2-wire pulse transmitters directly.

• Benefit: Eliminates external power supplies for connected devices.

• Consequently, the AAP135-S00/K4A00 simplifies field wiring for 2-wire sensors.

Withstand Voltage and Isolation Ratings

• Between Input and System: 500 V AC for 1 minute.

• Between Channels: 500 V AC for 1 minute.

• Isolation Type: Fully isolated channels.

• Dual-Redundancy Support: Yes, with proper configuration.

• Standby Channel Behavior: Shunt resistance opens automatically.

• Therefore, the Yokogawa AAP135-S00/K4A00 provides robust isolation for safety applications.

Current Consumption and Power Requirements

• 5V DC System Current: 300 mA maximum.

• 24V DC System Current: 400 mA maximum.

• External Power: Required for field devices and transmitter supply.

• Module Type: Isolated pulse input.

• Thus, the AAP135-S00/K4A00 requires moderate power for 8-channel operation.

Physical Specifications and Weight

• Weight: 0.3 kg (module only).

• With KS Adapter: Additional weight from ATK4A-00 adapter.

• External Connection Options:

  • Pressure clamp terminal.

  • KS cable (with /K4A00 adapter).

  • MIL connector cable.

• KS Cable Interface Adapter: Model ATK4A-00 (included with /K4A00).

• Therefore, flexible connection options suit various installation preferences.

Installation Guide

First, verify that system power is completely disconnected. Then, select your preferred connection method (pressure clamp, KS cable with ATK4A-00, or MIL connector). If using KS cable, the /K4A00 adapter is pre-installed. After that, mount the Yokogawa AAP135-S00/K4A00 into the designated I/O slot. For dual-redundant operation, install two modules and configure accordingly. Next, connect your pulse-generating field devices to the 8 input channels. For contact inputs, ensure open >100kΩ and close <200Ω. For voltage pulses, ensure VH between 3-24V DC and VL between -1-8V DC. Then, select the appropriate shunt resistance per channel (none/200/500/1000 Ω). Configure the transmitter power supply (12V or 24V DC) as needed. Set the input filter for chattering elimination if required. Subsequently, connect system power (5V and 24V) to the backplane. Finally, power on the system and verify pulse counting operation. As a result, the Yokogawa AAP135-S00/K4A00 will provide reliable pulse input measurement.

Packaging List

• One Yokogawa AAP135-S00/K4A00 pulse input module

• One KS cable interface adapter (ATK4A-00, pre-installed)

• One pressure clamp terminal block (or MIL connector per order)

• One product identification label

• One installation and configuration guide

Common FAQs

Q1: How many input channels does the AAP135-S00/K4A00 provide?
A: This module provides 8 isolated input channels. Specifically, isolation exists between each channel and from the system. Therefore, it suits applications requiring high channel-to-channel isolation.

Q2: What is the maximum input frequency of this pulse input module?
A: The maximum input frequency is 10 kHz. The minimum input pulse width is 40 microseconds. Consequently, it captures high-speed pulse trains from encoders and flow meters.

Q3: Does the Yokogawa AAP135-S00/K4A00 support dual-redundant configuration?
A: Yes, dual-redundant configuration is supported. The shunt resistance automatically opens on the standby side. Therefore, high availability is achieved for critical pulse counting applications.

Q4: What transmitter power supply options are available?
A: Selectable transmitter power is 24V DC or 12V DC. The 12V output provides 40 mA maximum. The 24V output provides 30 mA maximum. Thus, 2-wire pulse transmitters can be powered directly.

Q5: What external connection options exist for the Yokogawa AAP135-S00/K4A00?
A: Three connection types are available. Pressure clamp terminals are supported. KS cable with ATK4A-00 adapter is included. MIL connector cables also work. Therefore, flexible wiring suits various installation requirements.