YS170-012/A06/A31

The Yokogawa YS170-012/A06/A31 is a programmable controller from the YS100 series, designed for process measurement and control. This configuration combines an isolated two-wire transmitter input with an RS-485 communication interface. It is intended for applications requiring a transmitter signal input and serial data exchange with compatible control or supervisory systems.

Functional Configuration

The model suffixes identify the following configuration:

• YS170: YS100 series programmable controller.
• -012: Power supply version rated for 138-264 VAC or 120-340 VDC.
• /A06: Isolated two-wire transmitter input.
• /A31: RS-485 communication interface.

The /A06 input option provides electrical isolation for the two-wire transmitter signal path. This is relevant when connecting field transmitters to a controller because the input configuration determines the signal interface and isolation arrangement.

Communication Interface

The /A31 option provides RS-485 serial communication. The YS100 series documentation identifies this interface for communication with compatible equipment using supported communication protocols. The communication option must be considered when checking host-system compatibility and serial communication settings.

Control Functions and Signal Assignment

The YS170 supports programmable control strategies. Its analog and discrete inputs and outputs can be assigned according to the user-defined control program. This allows signal routing and control functions to be configured for the intended process requirements.

The controller supports single-loop and dual-loop control configurations within the YS170 platform. The actual control strategy and I/O assignments depend on the loaded program and configured terminal functions.

Technical Specifications

Parameter	Specification
Model	YS170-012/A06/A31
Brand	Yokogawa
Product Series	YS100
Product Type	Programmable Controller
Power Supply	138-264 VAC, 47-63 Hz
DC Power Supply	120-340 VDC
Maximum Power Consumption	29 VA at 220 VAC
Input Option	/A06 - Isolated two-wire transmitter input
Communication Option	/A31 - RS-485
Mounting	Panel mounting, flush-mounted
Operating Environment	Indoor installation

Installation and Signal Connection

The YS100 series uses rear screw terminals for power and field signal connections. For transmitter wiring, signal polarity must be observed, particularly when using the controller's 24 VDC loop power supply.

The controller's programmable I/O assignments should be completed before connecting field devices. This ensures that the physical terminal connections correspond to the intended control functions.

Frequently Asked Questions

Q: What type of transmitter can be connected to the YS170-012/A06/A31?

A: The /A06 option is designed for isolated two-wire transmitter input. The transmitter signal and wiring arrangement must follow the specified input configuration.

Q: What communication interface does this controller provide?

A: The /A31 option provides RS-485 communication. Communication wiring and protocol settings must match the connected host equipment.

Q: What should be checked when replacing this controller?

A: Verify the -012 power configuration, /A06 transmitter input, /A31 communication interface, terminal assignments, and existing control program. A replacement must preserve the required electrical and functional configuration.

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