Siemens 6DS1723-8BB Analog Input Module for SICOMP C30/C35 Industrial Racks

Product Overview

The 6DS1723-8BB is a Siemens analog input module belonging to the SICOMP C30 / CICOMP C35 industrial computer rack family — the same platform that the 6DS1300-8AB monitor/keyboard interface serves. While the 6DS1300 handles the operator-console side, the 6DS1723-8BB sits on the process-signal side: it plugs into a SICOMP C30 or C35 backplane and converts field analog loops (current, voltage, temperature sensors) into the digital domain that the SICOMP CPU board can process. This makes it a core piece of the SICOMP-based small-to-mid DCS nodes that were widely deployed in European glass, chemical batch, power-auxiliary, and pulp & paper lines from the late 1980s through the 2000s.Unlike a SIMATIC S7 analog card, the 6DS1723-8BB is not a Profibus/Profinet device and does not carry 230 V mains or an EMI filter — those specs you see on some reseller pages are template pollution copied from S7 drive listings. What the 6DS1723-8BB actually does is backplane-bus-driven, 8-channel analog acquisition with per-channel software/configurable signal-type selection (typical SICOMP 6DS1723 family behavior: 0/4–20 mA, 0–10 V / ±10 V, thermocouple, RTD such as Pt100/Ni100/Cu10 depending on firmware/hardware version), 12-bit or higher resolution, channel-group isolation, and onboard broken-wire detection for current and RTD loops. Power comes from the SICOMP backplane (+5 V / +12 V logic side) supplemented by external +24 V DC for the field side — a dual-rail scheme typical of SICOMP analog slices, since the field loop often needs 24 V for two-wire transmitters while the A/D and backplane logic stay at low voltage.In a running plant, the 6DS1723-8BB is what lets a SICOMP C30 node read a lehr-zone thermocouple string, a batch-tank 4–20 mA level transmitter, or a furnace pressure transducer. If it drifts or dies, those loops either go stale in the SICOMP CPU or drop to substitution value — which is why, on a 25-year-old SICOMP line, having a cold-spare 6DS1723-8BB on the shelf is cheaper than engineering a full HMI+IOSB retrofit onto a modern SIMATIC IPC. The module is long obsolete from the Siemens active catalog and now lives entirely in the secondary/spare-parts market, where authenticity (SICOMP backplane keying, correct -8BB suffix, clean connector fingers) matters more than datasheet headlines.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	6DS1723-8BB
Manufacturer	Siemens AG
Product Type	Analog Input Module (SICOMP family)
Series / Platform	SICOMP C30 / CICOMP C35 Rack System
Number of Channels	8 (independent / group-isolated, configuration-dependent)
Input Signal Types	0/4–20 mA, 0–10 V, ±10 V, Thermocouple (TC), RTD (Pt100, Ni100, Cu10) — subject to hardware version
Resolution	12-bit + sign (typical for 6DS1723 family; some -8BA/-8BB revisions quote 12/16-bit capable)
Conversion Time	< 1 ms per channel (typical)
Isolation	Channel-group / channel-to-ground, 2.5 kV test voltage class
Break Detection	Supported (open-wire for current and RTD loops)
Power Supply	SICOMP backplane bus (+5 V / +12 V logic) + external 24 V DC (field side)
Operating Temperature	0 °C to +55 °C
Storage Temperature	-25 °C to +70 °C
Relative Humidity	5 % to 95 % (non-condensing)
Protection Rating	IP20 (cabinet internal)
Mounting	SICOMP rack slot, edge-connector to backplane
Certification	CE, UL (per original release)

📌 Reseller caveat: Listings that show “208–240 V AC”, “Profibus/Profinet”, “EMI filter 230 V”, “built-in PLC”, “RFI-switch”, or “frequency range 0.1–600 Hz” for the 6DS1723-8BB are copying S7 drive/inverter template text onto the wrong model. The authentic 6DS1723-8BB is a SICOMP C30/C35 backplane analog input slice — low-voltage logic, external 24 V field, no mains, no fieldbus.

Main Features and Advantages

Universal signal acceptance per channel. The strongest argument for keeping a 6DS1723-8BB on a legacy SICOMP node is that one module type covers almost every analog sensor a C30/C35 cabinet sees — two-wire 4–20 mA transmitters, 0–10 V potentiometer feedback, ±10 V PID loopbacks, Pt100 RTDs for furnace zoning, and thermocouples for high-temp spots. On plants where the instrument pool is a mix of 1990s-vintage and slightly newer 4–20 mA replacements, the 6DS1723-8BB lets you avoid stocking three different SICOMP analog-card variants. Configuration is handled through the SICOMP host software / dip-switch or EEPROM map depending on firmware revision — no DIP-per-channel nightmare, just a unified card.Isolation that survives cabinet EMI. SICOMP racks often sit next to contactors, VFD cubicles, or thyristor-fired furnace drives. The 6DS1723-8BB uses channel-group isolation with a 2.5 kV test rating and a shielded A/D front-end, which means a noisy 480 V compartment downstream won’t inject ghost counts onto your 4–20 mA tank-level loop. In float-glass lehr and batch-chemical applications, this isolation is what keeps the SICOMP CPU from seeing spurious temperature spikes that would otherwise trigger an unnecessary diversion or batch-hold.Broken-wire detection as process insurance. For current loops and RTD legs, the 6DS1723-8BB can flag an open circuit at the channel level. In a SICOMP C30 node controlling a multi-zone furnace, that detection feeds straight into the SICOMP alarm logic — so a chewed thermocouple lead or a loose terminal doesn’t silently substitute a last-good value and drift the zone. This is one of those “invisible” features that only matters at 3 a.m. on a Saturday, but when it matters, it saves the batch.Dual-rail power, clean partitioning. The 6DS1723-8BB draws logic from the SICOMP backplane (+5 / +12 V) and field excitation from external 24 V DC. That split keeps noisy field return currents off the backplane and lets the SICOMP CPU side stay quiet even when a 4–20 mA loop has a marginal shield ground. For retrofits where someone tried to “simplify” by bridging field 24 V onto the backplane rail — don’t. The 6DS1723-8BB expects the split; violating it is a fast way to cook the backplane interface ASICs.Obsolescence-era economics. A new SIMATIC S7-1500 + ET 200 + analog modules + SICOMP-replacement HMI is a five-figure engineering project minimum, and it forces you to rewrite the C30/C35 application logic (which may be undocumented 1990s-era SICOMP OS code). Dropping a spare 6DS1723-8BB into the same rack slot it came from costs two orders of magnitude less and changes nothing upstream. For asset managers on “run it until it breaks, then decide” lines, that’s the value proposition.