AAP135-S53/K4A00

The Yokogawa AAP135-S53/K4A00 is an 8-channel isolated pulse input module designed to receive and count contact ON/OFF signals, voltage pulses, and current pulses in a control system. It supports input frequencies up to 10 kHz and provides electrical isolation between the field inputs, individual channels, and the system. The /K4A00 ordering option specifies a KS Cable Interface Adapter.

Functional Description

The AAP135 receives pulse signals from field devices and converts them into count data for processing by the control system. It supports both two-wire and three-wire input arrangements, including contact signals and externally powered pulse signals.

Its eight input channels are electrically isolated from one another and from the system side. This separation helps limit the propagation of electrical disturbances between field signal circuits.

Input Signal and Counting Characteristics

The module accepts three principal signal types:

• Contact ON/OFF: Signals from relay contacts or transistor contacts.
• Voltage pulse: Voltage-level pulse signals from field instruments.
• Current pulse: Current-based pulse signals, internally converted to voltage for input processing.

The input frequency range of 0 to 10 kHz supports pulse-counting applications where signal frequency represents the operating rate or accumulated quantity of a field process. The minimum input pulse width is 40 us.

Electrical Isolation and Signal Conditioning

The module provides withstand voltage of 500 V AC for 1 minute between the input and system sides, and between individual input channels. This isolation arrangement allows separate field signal circuits to be connected without directly sharing their signal reference.

Additional signal-conditioning functions include:

• Selectable shunt resistance: None, 200 ohm, 500 ohm, or 1000 ohm.
• Pull-up resistance: 68 kohm, selectable for 12 V DC or 24 V DC.
• Configurable filtering for eliminating contact chattering.
• Selectable transmitter power supply: 12 V DC or 24 V DC.

For dry-contact inputs, the chatter-elimination filter is specified for signals up to 10 Hz.

Ordering Configuration

The complete ordering code identifies the module type, environmental configuration, and cable interface option.

Code	Specification
AAP135	8-channel isolated Pulse Input Module
-S	Standard type
5	Without explosion protection
3	ISA Standard G3 option and temperature option (-20 to 70 deg C)
/K4A00	KS Cable Interface Adapter, model ATK4A-00

The AAP135-S53/K4A00 therefore combines the standard, non-explosion-protected module configuration with the ISA G3 and extended-temperature options, together with the specified KS cable interface adapter.

Technical Specifications

Parameter	Specification
Model	AAP135-S53/K4A00
Brand	Yokogawa
Product Type	Pulse Input Module
Number of Input Channels	8, isolated
Input Signal	Contact ON/OFF, voltage pulse, current pulse
Input Configuration	2-wire and 3-wire
Input Frequency	0 to 10 kHz
Minimum Input Pulse Width	40 us
Data Update Period	2 ms
Input-to-System Isolation	500 V AC, 1 minute
Channel-to-Channel Isolation	500 V AC, 1 minute
Contact Input Open Level	100 kohm or higher
Contact Input Close Level	200 ohm or lower
Voltage Pulse High Level	3 to 24 V DC
Voltage Pulse Low Level	-1 to 8 V DC
Voltage Pulse Swing	3 V or higher
Signal Source Resistance	1 kohm or lower
Shunt Resistance	None / 200 / 500 / 1000 ohm
Pull-up Resistance	68 kohm
Transmitter Power Supply	Selectable 12 V DC / 24 V DC
Power Supply Current Limit	40 mA at 12 V DC; 30 mA at 24 V DC
Maximum Current Consumption	300 mA (5 V DC), 400 mA (24 V DC)
Operating Temperature Option	-20 to 70 deg C
Explosion Protection	Without explosion protection
Environmental Option	ISA Standard G3
Cable Interface Adapter	ATK4A-00
Weight	0.3 kg
External Connection	Pressure clamp terminal, KS cable, MIL connector cable

Frequently Asked Questions

Q: Can the AAP135-S53/K4A00 receive both contact and voltage pulse signals?

A: Yes. It accepts contact ON/OFF, voltage pulse, and current pulse signals. The appropriate field wiring and input configuration depend on the signal source and connection method.

Q: Does the 10 kHz input frequency apply to all contact input configurations?

A: No. The general input frequency specification is 0 to 10 kHz, but the frequency is limited to 0 to 800 Hz between terminals B and C when receiving non-voltage contact signals. This distinction should be considered when selecting the input wiring.

Q: Is the AAP135-S53/K4A00 suitable for dual-redundant configurations?

A: The AAP135 module supports dual-redundant configuration. The shunt resistance is open on the standby side in a dual-redundant arrangement. The complete system configuration must follow the applicable Yokogawa installation requirements.

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