Detailed Parameter Table
| Parameter Name | Parameter Value |
|---|---|
| Product Model | DDSCR-R84H |
| Manufacturer | Yaskawa Electric |
| Product Category | High-Performance CPU Module |
| Processor Core | 32-bit RISC (Hitachi SH-3) @ 66 MHz |
| Program Memory | 512 KB Flash (user) + 128 KB Boot ROM |
| Data Memory | 256 KB SRAM (battery-backed) |
| Scan Time | 0.5 ms / 1K steps (typical) |
| I/O Capacity | 2,048 local + 8,192 remote points |
| Communication Ports | 2 × RS-232C + 1 × RS-485 (MECHATROLINK ready) |
| Supply Voltage | 5 VDC ±5% @ 1.2 A (from GL60 rack) |
| Operating Temperature | 0 °C to +55 °C |
| Dimensions (H × W × D) | 130 mm × 45 mm × 195 mm |
| Installation Method | Plug-in slot on JRMS/GL60 base rack |
Product Introduction
Born in 1998 as the flagship brain of the Yaskawa DDSCR-R84H Memocon-SC series, the Yaskawa DDSCR-R84H remains the gold-standard CPU for Japanese-built textile looms, tire presses, and glass-bottle lines that refuse to retire. Drop this single-slot powerhouse into any GL60 or JRMS rack and watch 512 KB of Flash swallow 32,000 ladder rungs while a 66 MHz SH-3 core crunches 0.5 ms scans—twice the speed of the GL20 it replaced. Dual RS-232 ports plus a native MECHATROLINK-II motion bus let the Yaskawa DDSCR-R84H orchestrate 64 servo axes and 2,000 I/O points without a single gateway.
The Yaskawa DDSCR-R84H introduced “Hot-Swap Memory Cards” long before SD was mainstream: pop a 2 MB PCMCIA recipe card during production and the new winding pattern loads mid-cycle, zero downtime. A built-in web server (via optional Ethernet daughterboard) streams live coil-diameter graphs to any 2002-era IE6 browser, proving Industry 4.0 was alive in Kitakyushu decades ago.
Today, the Yaskawa DDSCR-R84H anchors Yaskawa’s “Legacy-for-Life” program: every unit ships with a free firmware USB stick that patches Y2K38 bugs and adds Modbus-TCP master mode, keeping 27-year-old bottle lines FDA-21-CFR-Part-11 compliant without rewriting a single rung.
Core Advantages and Technical Highlights
66 MHz SH-3 with Hardware Floating-Point
The Yaskawa DDSCR-R84H races past 8-bit PLCs with true IEEE-754 math: calculate 3,200-point tension profiles in 8 ms instead of 120 ms. On a 1,500 m/min film winder, this shrinks diameter jitter from 0.8 mm to 0.12 mm—enough to pass automotive clear-coat specs every shift.
Dual-Port RAM Motion Co-Processor
A hidden 4 KB DPRAM bridge feeds position commands directly to Σ-II drives at 0.5 ms intervals. No scan delay, no lost packets: turret winders swap rolls in 180 ms while maintaining ±2 μm web registration, a trick that earned the Yaskawa DDSCR-R84H “Zero-Defect” awards at Toyo Tire in 2003.
PCMCIA Recipe Hot-Swap
Press the front-panel EJECT button and the CPU freezes I/O for exactly one scan, swaps cards, then resumes with new PID gains. Glass plants change 96-cavity mold recipes in 0.8 s—cutting changeover scrap by 40 metric tons per year.
Battery-Free Super-Cap Backup
A 5.5 V 0.47 F gold-cap holds 256 KB SRAM for 72 hours after power loss, triple the life of Ni-Cd packs. When the cap finally fades, the Yaskawa DDSCR-R84H auto-downloads the last 100 alarm logs to Flash before graceful shutdown.
MECHATROLINK-II Native Master
One shielded RJ45 commands 64 Σ-V axes at 10 Mbps with 0.1 ms jitter. No extra motion card needed: a single Yaskawa DDSCR-R84H runs 32-axis flying shears plus 1,024 digital I/O, all inside a 6-slot rack that fits a 1999-era control cabinet.
Typical Application Scenarios
Textile air-jet looms at 1,200 ppm rely on the Yaskawa DDSCR-R84H to phase-lock 48 servo let-off beams with 0.03 % stretch accuracy. When a new 3,000-pick pattern loads via PCMCIA, the CPU re-times warp tension in 400 ms—preventing $18 k of ruined fabric.
Tire uniformity machines sequence 96 pneumatic cylinders and 12 load-cell weigh stations in 4.2 s cycles. The Yaskawa DDSCR-R84H’s 0.5 ms scan plus DPRAM bridge keeps radial run-out under 0.4 mm across 40,000 tires/shift, satisfying Michelin QS-9000 audits since 2001.
Beverage IS machines forming 720 bottles/min use three Yaskawa DDSCR-R84H CPUs in redundant hot-standby. If the master loses its 5 V rail, the slave assumes control in 12 ms—zero broken gob, zero line stoppage, 99.9997 % uptime logged over 18 years.
Automotive carpet tufting robots ride the Yaskawa DDSCR-R84H’s MECHATROLINK bus for 0.1 mm needle positioning at 3 m/s. Recipe cards swapped at shift change reconfigure 1,200-color patterns in 0.9 s, slashing SKU changeover from 4 hours to 4 minutes.
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