YS1700-030

The Yokogawa YS1700-030 is a programmable indicating controller designed for process measurement, control, calculation, and operator interaction. It supports text-based and function block programming, with configurable control functions including single-loop, cascade, and selector control. Its dual-CPU architecture, nonvolatile memory, and flexible analog and digital I/O provide options for different control and replacement requirements.

Control Functions and Programming

The YS1700 supports two user-programming methods:

• Text programming: Supports programs with a capacity of up to 1,000 steps and provides compatibility with the programming approach used by earlier models.
• Function block programming: Provides a GUI-based programming method with a capacity of up to 400 function modules.
• Function selection mode: Allows users to select commonly used control functions, including single-loop, cascade, and selector control, without developing a custom program.

The optional YSS1000 Setting Software for the YS1000 Series is used to develop user programs. More than 100 types of calculation modules are available, including exponential and logarithmic calculations, temperature compensation, and pressure compensation.

Display and Operator Interface

The controller uses a full-dot color LCD to display process values, trends, bar graphs, alarms, and events. Operators can select the required display from the front panel, and parameter settings can be configured directly through the display.

The separate control and display CPUs allow display and manual operation to remain available during a failure of either CPU. An independent hard manual circuit also permits manual adjustment of the controller output if the digital circuits, including both CPUs, fail. This hard manual circuit is not included when the /NHM option is specified.

I/O Configuration

The basic model with expandable I/O supports analog and digital signal handling. Its maximum stated configuration is:

• 8 analog inputs (AI).
• 4 analog outputs (AO).
• 14 digital I/O points in total, configurable as digital inputs (DI) or digital outputs (DO).

The expandable I/O interface must be specified when ordering. It cannot be added to the controller after delivery, so the required I/O capacity should be considered during initial configuration.

Power Supply and Memory Backup

The YS1700 supports an AC/DC dual-power configuration using 100 V AC or 24 V DC. DC power can be connected without polarity restrictions. A separate 220 V AC power configuration must be specified at the time of ordering.

Nonvolatile memory retains stored data without batteries or backup capacitors. This removes the need for periodic battery replacement as part of memory-backup maintenance.

Communication Interfaces

Optional communication functions support connection with external control and monitoring systems:

• Ethernet: Modbus/TCP communication, available for the basic type.
• RS-485: PC Link, Modbus, peer-to-peer communication, and YS protocol.
• DCS-LCS communication: Provides an additional communication option for compatible system configurations.

The available communication options depend on the controller type. In particular, RS-485 is unavailable for the YS80 internal unit-compatible type.

Mechanical Design and Protection

For the basic type, the controller has a mounting depth of 250 mm and an IP54 dust- and splash-protected front panel. These specifications should not automatically be applied to the YS80-compatible or other replacement configurations.

CE marking is specified for the basic type and YS100-compatible type. FM nonincendive protection is an optional feature for the basic type. The certification and protection options must be checked against the actual ordered configuration.

YS100 Series Replacement Compatibility

The YS1700 supports replacement-oriented configurations for earlier controller installations. Its YS100-compatible version uses the YS100 case, while other versions are available for specific YS80 and legacy controller mounting arrangements.

For basic-type installations, the terminal-to-terminal pitch differs from earlier arrangements, although the relative signal-to-terminal layout is almost the same. Mechanical fit and terminal wiring should therefore be checked against the installed controller before replacement.

Technical Specifications

Parameter	Specification
Model	YS1700-030
Brand	Yokogawa
Product Type	Programmable Indicating Controller
Series	YS1000 Series
Control Modes	Single-loop, cascade, selector, programmable
Text Program Capacity	1,000 steps
Function Block Capacity	400 modules
Calculation Format	IEEE 754, 4-byte floating point
Calculation Functions	Exponential, logarithmic, temperature compensation, pressure compensation
CPU Architecture	Dual CPU (control and display)
Display	Full-dot color LCD
Memory Backup	Nonvolatile memory
Expandable I/O (applicable configuration)	8 AI, 4 AO, 14 DI/DO points total
Power Supply Options	100 V AC / 24 V DC or separately specified 220 V AC
Programming Software	Optional YSS1000 Setting Software
Communication Options	Ethernet Modbus/TCP, RS-485, DCS-LCS
Compatible Controller Configuration	YS80 internal unit-compatible type

Frequently Asked Questions

Q: Can the YS1700-030 replace an earlier YS80 controller?

A: The YS1700 product range includes a configuration specifically designed for YS80 internal unit compatibility. The exact mounting, terminal arrangement, and wiring requirements should be checked against the existing controller before replacement.

Q: Does the YS1700-030 support custom control logic?

A: Yes. The YS1700 supports text programming and GUI-based function block programming. The optional YSS1000 Setting Software is used to develop user programs.

Q: Can the controller maintain manual output if its CPUs fail?

A: The YS1700 can use an independent hard manual circuit to adjust the controller output during digital circuit failures, including failures involving both CPUs. This function is configuration-dependent and is not available when the /NHM option is specified.

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