Product Overview

The 6ES5470-7LB13​ is a high-isolation analog output module within Siemens’ SIMATIC S5 PLC ecosystem, belonging to the S5 470 “floating/isolated” AO family and designated as the B-variant—meaning 8 outputs at ±10 V DC only, without the current-loop capability of the A-variant or the 1–5 V / 4–20 mA range of the C-variant. Engineered in the S5 “7L” mechanical format (40 mm × 255 mm × 195 mm), the 6ES5470-7LB13​ is specified by Siemens for S5-115U/F PLC racks (the “/F” denoting qualification for the fail-safe S5-115F variant as well) and, by virtue of the 7L bus compatibility, also seats without adaptation into S5-135U/155U central and expansion racks via the standard IM310/IM360 interface—making it one of the most broadly siting-flexible AO modules in the S5 catalog. The “floating” designation is the 470 family’s core differentiator from the cheaper 471/472 non-isolated AOs: every output channel on the 6ES5470-7LB13​ is galvanically isolated from the S5 backplane bus and from every other channel, tested to 500 V AC, which eliminates ground-loop-induced drift when driving field devices whose 0 V reference differs from the PLC cabinet ground.Internally, the 6ES5470-7LB13​ carries an 8-channel, 12-bit (11 bits + sign) D/A architecture that maps the S5-standard peripheral output word PQW to -27648 … +27648 counts across the ±10 V span, yielding sub-millivolt effective resolution well-suited to drive-speed setpoints, proportional valve commands, and recorder inputs. The module draws 5 V DC (~250 mA typical) from the S5 backplane for its logic and reference section, and requires an external 24 V DC supply (∼300 mA typical) to power the isolated output stages—separation that keeps analog-noise-generating output drive current off the backplane. Rated power dissipation is approximately 8.5 W under full load, placing it in the mid-thermal class of S5 I/O (warmer than digital I/O, cooler than AC output modules like the 456 series). Siemens placed the 6ES5470-7LB13​ into PLM PM500 status effective October 1, 2022, deleted without replacement—meaning no S5-native successor exists and verified spare stock is the only sustaining path for the substantial S5-115U/F and S5-135U/155U installed base still running in extrusion, converting, batch-pharma, water treatment, and metals processing.

Technical Specifications

Main Features and Advantages

Per-channel floating isolation (470 vs. 471/472 differentiator): The 6ES5470-7LB13​ belongs to the 470 “floating” sub-family, where every one of the 8 output channels is galvanically isolated from the S5 backplane bus and from its seven siblings, tested to 500 V AC. This is the defining commercial and technical edge over the 471/472 non-isolated AOs, which share a common analog ground with the backplane. In real plants—where a VFD cabinet 0 V drifts several volts above the S5 rack’s 24 V 0 V/M due to cable shields, stray currents, or multi-building grounding schemes—a non-isolated AO will inject that offset into the ±10 V command, making a “0 V = stop” instruction read as “+0.8 V = 8% speed” at the drive. The 6ES5470-7LB13​ kills that mechanism: each channel’s M (return) floats independently, so the drive’s 0 V and the PLC’s 0 V can differ by tens of volts without corrupting the command. For plants running S5-115U/F on extrusion lines, multi-motor winders, and proportioning-hydraulic presses, this isolation is not a nice-to-have—it’s why the 470 family survived in S5 bills-of-materials long after cheaper alternatives were tried and rejected.B-variant purity: ±10 V only, no current mode. The 470 family splits into A (±10 V + 0–20 mA), B (±10 V only), and C (+1–5 V + 4–20 mA). The 6ES5470-7LB13​ is the B—the purist’s choice for drive-setpoint and proportional-valve applications where bipolar voltage is the universal language. European VFD platforms, DC drive stands, and Bosch/Rexroth/Atos proportional valve amplifiers almost universally accept -10 V … +10 V for reverse/forward or retract/extend commands, making the B-variant the most “plug-and-play” AO in an S5 rack driving a machine-tools or converting line. By omitting the current-loop driver stage (present on the A-variant), the 6ES5470-7LB13​ also runs slightly cooler and simpler—no worry about loop-supply drop across long 4–20 mA runs, because that’s not its job. For panel builders standardizing on “voltage AO for drives, separate 454 DC DO for on/off, separate 456 AC DO for contactors,” the B-variant is the cleanest SKU.12-bit + sign into S5-standard -27648/+27648: The 6ES5470-7LB13​ delivers 12-bit core DAC resolution with an additional sign bit, presented to the S5-115U/F CPU as the conventional S5 peripheral output word range. Over a ±10 V span this yields effective granularity well under 1 mV/LSB, which translates to <0.01% of full-scale on a 2000 rpm drive speed reference—fine enough that the S5 PID (FB 61 in S5-135U/155U, or equivalent S5-115U blocks) sees smooth PV→PQW transitions without stair-stepping visible on SCADA trend records. For applications like calendar roll gap positioning (proportional valve ±10 V command from S5), the extra bit over an 11-bit alternative reduces dither on the hydraulic servo loop.7L format = S5-115U/F native + S5-135U/155U expansion-compatible: The 6ES5470-7LB13​ uses the “7L” mechanical/electrical profile—40 mm wide, standard S5 I/O bus pinout—qualified by Siemens for S5-115U/F central racks (slots 3–10, with slot 1 = PS, slot 2 = CPU). Because the 7L bus is the same physical/electrical standard used by S5-135U/155U central and IM-expanded racks, the same 6ES5470-7LB13​ drops into a S5-135U expansion rack downstream of an IM360/IM310 without re-wiring or re-qualification. For plants running mixed S5-115U (machine-level) and S5-135U/155U (cell-level) tiers, standardizing spare SKUs on 7L-format modules collapses inventory—one 6ES5470-7LB13​ serves both tiers, unlike the 8M-format modules (e.g., the 464-8MF21 we covered earlier) which are central-rack-only.