Product Overview
The 6DD1682-0CH2 is the Siemens SIMATIC TDC Subrack UR5213, the second-generation 21-slot chassis that forms the physical and electrical backbone of a SIMATIC TDC cabinet. While the previous model in this series (6DD1660-0BF0) is a plug-in communication/GDM module and the PM6/PM7 are the processors, the 6DD1682-0CH2 is the subrack itself—the Eurocard-sized, 19-inch-class chassis into which all TDC modules seat: CPUs (PM6, PM7), communication processors (CP 52M0 family including the GDM-only -0BF0 covered earlier), I/O interface modules (IT41, SBP1, etc.), and the dedicated power-supply + fan unit (6DD1683-0CH0, PS5213). The 6DD1682-0CH2 integrates a 64-bit parallel GDM (Global Data Memory) backplane bus capable of microsecond-scale data exchange between slots, wide-range AC input (95–255 V) that feeds the integrated system power section, a permanently installed fan tray, and a 5-tier front female connector row for distributed I/O cabling egress. At ~19.4 kg naked (per Siemens shipping data), it is a substantial, rigid steel/aluminum chassis built for vibration-prone mill and test-stand environments.
Siemens classifies the 6DD1682-0CH2 under PLM PM410 (product cancellation effective November 1, 2015), with the documented successor being 6DD1682-0CH3 (UR6021, 21-slot, VMEbus-compatible, 8 P0 slots, replaceable fans, same GDM 5-tier connector footprint). The -0CH2 itself is the direct replacement for the first-generation UR5213 (6DD1682-0CH0), resolving minor mechanical/component revisions while keeping slot numbering and backplane behavior identical, so a 6DD1682-0CH2 drops into a cabinet originally specced -0CH0 without project or backplane rewiring. For plants still running active TDC racks—hot-strip mills, full-vehicle powertrain dyno cells, turbine control retrofits—the 6DD1682-0CH2 remains the correct spare subrack, whether to replace a damaged chassis or to populate a second redundant rack during a phased capacity expansion before committing to a UR6021 or full TDC→SINAMICS migration.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 6DD1682-0CH2 |
| Manufacturer | Siemens |
| Product Type | SIMATIC TDC Subrack / Backplane Unit (UR5213, 2nd gen) |
| Slot Count | 21 slots (Eurocard format, TDC module compatible) |
| Backplane Bus | 64-bit parallel GDM (Global Data Memory) bus, <100 μs cycle capable |
| Input Voltage | 95 – 255 V AC (wide-range, feeds integrated system PSU) |
| Cooling | Integrated fan tray (dedicated PS5213 PSU+fan module 6DD1683-0CH0 pairs with rack) |
| Front Connector | 5-tier (5-row) female plug-in connector strip for I/O cabling |
| Compatible Modules | PM6, PM7, CP 52M0 family, IT41, SBP1, all TDC Eurocard-format modules |
| Mounting | 19-inch cabinet / floor-standing (subrack form) |
| Successor | 6DD1682-0CH3 (UR6021, VMEbus, replaceable fans, 8 P0 slots) |
| Weight | ~19.4 kg |
| Operating Temp. | 0 °C to +60 °C (with forced air from integrated fan) |
| Protection | IP20 (cabinet-installed) |
| Lifecycle | PM410 – Product cancelled (01.11.2015) |
Main Features and Advantages
The 6DD1682-0CH2 earns its keep as the TDC rack’s foundation through three structural strengths. First, the 64-bit parallel GDM backplane. Unlike generic VME or CompactPCI backplanes where inter-card communication travels over message protocols, the 6DD1682-0CH2 backplane implements a dedicated 64-bit GDM parallel bus that lets any slot (CPU, comms, I/O) read/write shared memory regions at backplane electrical speed. This is what enables TDC’s signature microsecond-level multi-CPU synchronization: Stand-1 PM7 writes a 16 kword dataset to GDM in cycle N, Stand-2 PM7 reads it in cycle N+1, no protocol stack, no software mailbox, just bus-level handoff. The 6DD1682-0CH2 backplane sustains this across all 21 slots simultaneously, which is why a TDC rack can coordinate thousands of I/O points and multi-axis drive loops without jitter blow-up.
Second, integration density. The 6DD1682-0CH2 chassis incorporates the AC input stage (95–255 V wide-range, globally tolerant), the system power regulation (paired with the 6DD1683-0CH0 PS5213 supply+fan unit that occupies dedicated slots), the fan tray, and the 5-tier front connector strip—all in one 19-inch subrack. A cabinet builder doesn’t need a separate PSU chassis, separate fan box, or separate terminal rail for the TDC I/O egress; the 6DD1682-0CH2 consolidates them. The 5-tier connector row is particularly valued by wiring crews: distributed I/O (IT41, SBP1, etc.) lands its front-cable loom onto these 5 rows, keeping the rear backplane clear for module insertion/extraction and keeping the cabinet’s cable dress front-facing where it’s accessible during commissioning.
Third, mechanical and lifecycle practicality. The 6DD1682-0CH2 is the -0CH0 replacement, meaning Siemens revised the original UR5213 (6DD1682-0CH0) into this second-gen build—component updates, fan-tray refinement, likely BOM-cost and long-term-part continuity—while preserving slot map and backplane pinout. For a plant with ten -0CH0 racks in service, stocking 6DD1682-0CH2 as the spare means one SKU covers both the -0CH0 originals (drop-in) and any -0CH2-origin cabinets. And when the time comes to migrate, the successor path to UR6021 (6DD1682-0CH3) is documented by Siemens—same 21-slot count, same 5-tier connector, VMEbus addition, replaceable (vs. integrated) fans, different backup battery (3.6 V 2.3 Ah 6ES7971-0BA00 vs. whatever the -0CH2/PS5213 combo uses). The 6DD1682-0CH2 thus sits comfortably in the middle of a TDC lifecycle: old enough to be PM410, new enough that its successor path is clean and its spare ecosystem (NOS + tested-surplus) is still healthy through 2025+.
Application Field
The 6DD1682-0CH2 appears wherever a SIMATIC TDC rack is the control backbone. In hot-strip and cold-strip steel mills, a typical TDC cabinet populates a 6DD1682-0CH2 with 2–4 PM7 CPUs (speed cascade / tension / gauge), 2–3 CP 52M0 modules (-0AE0/-0AF0 for optical/RS485, -0BF0 for GDM expansion), IT41/SBP1 I/O for drive-terminal tie-in, and the 6DD1683-0CH0 PS5213 occupying its dedicated PSU slots—the whole assembly living in a mill pulpit or motor-room cabinet. In powertrain test cells (engine dyno + transmission + road-load emulation), the 6DD1682-0CH2 hosts the multi-CPU TDC that splits dynamometer control, safety supervision, and data-acq aggregation across PM6/PM7 siblings, with CP 52M0 handling the external comms to the cell PC and the 6DD1682-0CH2 GDM bus keeping the CPUs lock-stepped at sub-100 μs.
Power-generation retrofits (steam/gas turbine controls migrating from TELEPERM M to TDC) also deploy the 6DD1682-0CH2 as the rack chassis, since the 21-slot count accommodates protection CPU + control CPU + I/O + comms in one box. Research rigs—aerospace actuator test, rail dynamometer, marine propulsion emulation—use the same topology because TDC’s deterministic math and the 6DD1682-0CH2 backplane are why those rigs can close loops at speeds a standard S7-400 or S7-1500 R/H can’t quite hit without specialized add-ons.
Spare-strategy context: because Siemens cancelled the 6DD1682-0CH2 (PM410, Nov 2015), active TDC plants typically keep one or two bare 6DD1682-0CH2 chassis on the crib plus a full populated “hot spare” rack if the process is critical (e.g., main-drive mill stand). The chassis itself fails rarely—no active semiconductors, just backplane, connectors, fan tray, and sheet metal—but a bent backplane pin from a mishandled module insertion can condemn a rack, so having a 6DD1682-0CH2 shell ready avoids a forced UR6021 migration on emergency timeline.
Related Products
- 6DD1683-0CH0 – PS5213 power supply + fan module, the dedicated PSU unit that occupies reserved slots in the 6DD1682-0CH2 UR5213 rack; the “spare part for the rack” per Siemens forum.
- 6DD1682-0CH0 – UR5213 1st-generation subrack, replaced by 6DD1682-0CH2; the two are drop-in compatible on backplane/slot map.
- 6DD1682-0CH3 – UR6021, 21-slot successor to , VMEbus, 8 P0 slots, replaceable fans, documented migration from 6DD1682-0CH2.
- 6DD1600-0AF0 – PM6 CPU module, typical processor populating 6DD1682-0CH2 slots 1–N.
- 6DD1607-0AA0 – PM7 dual-core CPU, high-performance processor for 6DD1682-0CH2 multi-CPU racks.
- 6DD1660-0BF0 – CP 52M0 GDM 2 MB SRAM module (covered earlier), occupies a 6DD1682-0CH2 comms slot.
- 6DD1660-0AE0 / 6DD1660-0AF0 – CP 52M0 variants with optical/RS485 interfaces, comms siblings populating 6DD1682-0CH2.
- 6ES7971-0BA00 – 3.6 V 2.3 Ah backup battery, required for successor; the 6DD1682-0CH2 + combo uses a different backup scheme (worth noting for migration planning).