Description
Key Technical Specifications
| Parameter | Specification |
| Part Number | 57520001-ER (Also references suffix variants like -ER/1) |
| Module Type | Network Connection Unit / Coaxial Interface Board |
| Communication Protocol | MasterBus 300 / MasterBus 300E (IEEE 802.3 Standard) |
| Compatible Communication Boards | DSCS 140, DSCS 145 |
| Interface Port | Attachment Unit Interface (AUI) via 15-pin D-sub connector |
| Maximum Cable Length (AUI) | 30 meters |
| Mounting Configuration | DSRA Mounting Bar at the rear of the cabinet cubicle |
| Dimensions | 160 mm x 160 mm x 120 mm |
| Net Weight | 0.80 kg |
| Country of Origin | Sweden |
Product Introduction
The ABB DSTC190 (part number 57520001-ER or 57520001-ER/1) is a specialized network connection unit engineered for Advant OCS and Advant Master process control architectures. It acts as the physical, hardware-level interface that adapts the system’s internal controller communications to standard IEEE 802.3 coaxial-based Ethernet networks. Specifically, the DSTC190 links DSCS 140 and DSCS 145 communication boards directly to physical transceivers on the high-speed MasterBus 300 or MasterBus 300E network.
This interface board mounts at the rear of the cabinet enclosure on a DSRA mounting bar, shielding critical communication routing from the physical strain of field routing cables. By converting proprietary controller data backplane signals into a standard AUI interface, the DSTC190 allows robust, high-availability peer-to-peer data exchange across the plant network. Since the MasterBus 300 infrastructure is entirely obsolete at the OEM level, securing authentic, verified DSTC190 spares is critical for keeping legacy manufacturing units and marine automation grids online.
- DSTC190
- DSTC190
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
| Complete communication loss on MasterBus 300 network | Unseated or damaged AUI ribbon cable from DSCS board | ✅ High | Check the physical interface cable (DSTK 128/129) linking the DSCS 140/145 to the X90 port. Ensure both end locking clips are fully engaged. | Reseat the connection cable. If the diagnostic timeout alarm continues, proceed to test transceiver power. |
| Transceiver port fails to transmit or receive data packets | Lost 12 V DC transceiver power supply rail from the card | ✅ High | Use a Fluke 115 multimeter to verify that 12 V DC is present on the corresponding AUI interface pins of the D-sub port. | If the host controller is powered up but no auxiliary voltage is output to the transceiver, the board’s passive filtering components are damaged. Replace the board. |
| Frequent CRC or packet drop errors on the network | Coaxial cable segment grounding or impedance mismatch | ❌ Low | Test the physical network segment with a specialized cable tester. Check if the coaxial terminator resistors at the network ends are exactly 50\,\Omega. | Do not replace the connection unit. Troubleshoot the physical coaxial network trunk, repeaters, or drop transceivers. |
| Specific sub-rack communication board throws hardware faults | Internal ASIC chip failure on DSCS 140/145 processor card | ❌ Low | Inspect system diagnostics in the Advant Controller programming software to check for “Module Missing” or “Board Fault” errors. | The issue is likely on the active processor/comms board sitting inside the main card cage. Swap the DSCS card rather than this passive connection unit. |
Frequently Asked Questions (FAQ)
Is it safe to unplug the network cable from the while the controller is running?
While unplugging the network connector won’t physically damage the passive traces of the connection unit itself, doing so will immediately break the MasterBus 300 peer-to-peer data link. This will isolate the controller, causing instant communication timeout faults across your operator stations and adjacent controller nodes. Always verify that process safety loops are stable or that a redundant path is active before interrupting physical network connections.
What is the purpose of the DSRA mounting bar mentioned in the manual?
The is not designed to be mounted directly onto a standard cabinet backplate or standard DIN rails. Instead, it is designed to snap cleanly onto a specialized DSRA mounting bar positioned at the rear of your Advant OCS cubicle. This arrangement ensures proper mechanical grounding, routes incoming cable stress away from the main active cards, and keeps the cabinet layout neat and organized.
What is the maximum distance I can run from the to the transceiver?
Following the IEEE 802.3 and MasterBus 300 specifications, the maximum allowable length for the AUI interface cable (such as the DSTK 128 or DSTK 129 cable assemblies) linking the to its physical network coaxial transceiver is exactly 30 meters. Exceeding this distance will introduce unacceptable signal attenuation and propagation delays, leading to high packet-collision rates and erratic communication dropouts.
Does this connection unit require manual dip switch or jumper configuration?
No, the functions primarily as a physical routing interface and signal transceiver power distributor. There are no software configurations, firmware EPROMs, or DIP switches on this card. All network address parameters, node assignments, and transmission speeds are configured directly on the main host processor and its companion DSCS 140/145 communications processor boards.
How do you ensure the reliability of obsolete surplus boards like the ?
Since these units are no longer produced by the factory, we source our New Surplus and clean refurbished inventory from verified industrial surplus lots, integration cancelations, and spares reserves. Every unit is physically inspected for micro-cracks, trace oxidation, and connector wear, and undergoes testing to verify electrical continuity and proper power passthrough to the transceiver port. We back each unit with a complete 1-year replacement warranty.
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