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Yokogawa YS1700-101/A34 Programmable Indicating Controller

Configured for single-loop process control and operator indication in programmable controller architecture, the Yokogawa YS1700-101/A34 (YS1700 Programmable Indicating Controller) provides direct physical/electrical execution. The unit integrates analog signal acquisition, control computation, and local indication within a compact controller platform. Ethernet communication via Modbus/TCP enables external data exchange with supervisory systems. Dual-CPU architecture separates control processing from display and manual operation handling, maintaining local operation continuity under internal fault conditions.

Suffix Breakdown & Model Matrix

• YS1700: Base platform programmable indicating controller
• -1: Hard manual unit included for manual output handling
• 0: Standard enclosure and mounting configuration
• 1: Dual power supply compatibility (100-120 VAC or 24 VDC class input range as specified)
• /A34: Ethernet communication option supporting Modbus/TCP protocol

Hardware Specifications

Parameter	Specification
ModelBrand	Yokogawa YS1700-101/A34
Origin	Japan
Product Type	Programmable Indicating Controller
Control Capability	Single-loop / configurable multi-function logic
Analog Inputs	5 points (4-20 mA DC / 1-5 V DC)
Analog Outputs	3 points (4-20 mA DC / 1-5 V DC)
Digital Inputs	2 points
Digital Outputs	4 points
Communication	Ethernet Modbus/TCP
Memory	Non-volatile memory (no battery required)

DCS Process Control and Communication Layer

The YS1700 series implements process control functions through deterministic analog signal handling at 4-20 mA loop level combined with internal computation blocks. Channel-level isolation is applied between input acquisition, output driving, and internal logic processing domains to reduce loop interaction. Ethernet interface supports Modbus/TCP communication for data mapping into supervisory control systems or higher-level control networks. Floating-point computation structure enables consistent scaling and signal conditioning within industrial process loops.

Frequently Asked Questions

Q: Does the controller support operation continuity during CPU failure?
A: The architecture separates control execution and display/manual operation paths, allowing manual operation continuity under defined internal fault conditions.

Q: What communication protocol is supported on Ethernet interface?
A: The unit supports Modbus/TCP over Ethernet via the /A34 communication option.

Q: Can analog inputs and outputs be configured simultaneously for mixed signal operation?
A: Yes, analog I/O channels support mixed configuration within hardware channel limits (5 AI / 3 AO).

Field Installation Guidelines

• Maintain separation between analog signal wiring and power lines to reduce noise coupling on 4-20 mA loops
• Use shielded twisted pair cable for all analog inputs and outputs; terminate shield at single ground point
• Ensure proper grounding of controller chassis to industrial earth reference
• Verify correct voltage class before power-up (AC or DC configuration)
• Observe Ethernet cable routing separation from high-voltage switching lines to avoid communication interference
• Confirm all loop devices are correctly loop-powered before commissioning

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