Product Core Brief
- Model: YS1700
- Brand: YOKOGAWA
- Series: YS1000 Series
- Core Function: Executes dual-loop PID control with advanced function block programming.
- Product Type: Programmable Indicating Controller
- Key Specs: Dual CPU Architecture | 400 Function Blocks | Modbus TCP / RS-485
- Condition: New Original / New Surplus
Product Introduction
YOKOGAWA YS1700 programmable indicating controllers deliver high-reliability single-loop control. This industrial automation unit features dual CPUs and a hard manual backup for fail-safe operation.
The YOKOGAWA YS1700 supports up to 400 function blocks with a blazing 0.05-second control cycle. It uses non-volatile memory, eliminating the need for battery replacements and extending the replacement module’s operational lifespan significantly.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Control Cycle | 0.05s, 0.1s, 0.2s |
| Program Capacity | 400 Blocks / 1000 Steps |
| CPU Architecture | Dual CPU with Fail-Safe |
| Display Type | Full-Dot Color LCD |
| Communication | Modbus TCP, RS-485, DCS-LCS |
| I/O Expansion | Up to 8 AI, 4 AO, 14 DI/DO |
| Panel Protection | IP54 Dust and Drip Proof |
| Power Supply | AC 100V / DC 24V (or 220V AC) |
| Internal Resolution | 1/65536 for PID Operations |
| Safety Certifications | CE, FM Nonincendive (Optional) |
Quality Control Process
Every YOKOGAWA YS1700 undergoes a strict hardware validation process before shipping. We first verify the dual CPU architecture by simulating a primary processor fault to confirm the display and manual control functions fail over correctly. Next, technicians inject 4-20mA signals into the analog inputs using precision calibrators to verify the 1/10000 internal data resolution.
We also test the Modbus TCP and RS-485 communication ports under load to ensure zero packet drops. The hard manual backup circuit is physically actuated to confirm independent output adjustment. Finally, the unit is sealed in anti-static packaging to protect the sensitive logic boards during transit.
Replacement Pitfall Guide
❗ Verify the exact suffix code before ordering. The YOKOGAWA YS1700 has numerous variants for input types and communication options. A mismatched suffix code (like /A34 for Ethernet vs /A31 for RS-485) will halt your installation.
❗ Mind the panel cutout dimensions. While designed for easy replacement, verify the 96x96mm DIN cutout. Forgetting to account for mounting brackets or gaskets can cause fitment issues during retrofits.
❗ Check expansion I/O terminal availability. If your legacy system uses extra inputs, ensure you order the base model with expansion I/O. You cannot add expansion interfaces after the unit is received.
❗ Configure power supply options upfront. The unit accepts AC/DC or 220V AC, but this must be specified at the time of order. Wiring 220V to a 24V DC terminal will instantly destroy the power supply board.
Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
| Original Model | Replacement / Successor Model | Compatibility Level (Direct/Needs Adaptation) | Migration Notes |
|---|---|---|---|
| YS170 | YOKOGAWA YS1700 | Direct | Backward compatible with existing YS170 user programs |
| YS100 | YOKOGAWA YS1700 | Direct | Same panel cutout; terminal spacing differs slightly |
| YS80 | YOKOGAWA YS1700 | Needs Adaptation | Requires specific compatibility suffix codes (-3 or -4) |
- PID Internal Resolution: 1/65536, providing significantly finer control than older 1/4096 models.
- Fail-Safe Response: Dual CPU automatic failover occurs instantly, maintaining manual control and display visibility.
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