SIEMENS 6ES5452-8MR11 SIMATIC S5 Digital Output Module – 4 Relay Contacts 30V DC / 230V AC, Compact S5-90U/100U Spare

Product Overview

The 6ES5452-8MR11 is a digital output module from the Siemens SIMATIC S5 452 subseries, configured as a 4-channel relay output (4RO) variant with floating galvanic isolation between the S5 backplane logic and the field load side. Each channel provides an SPDT (single-pole double-throw) conversion contact—common (C), normally open (NO), and normally closed (NC)—giving the module 12 field terminals total (3 per relay) via the S5 front connector. Rated for 30 V DC / 230 V AC load switching, the 6ES5452-8MR11 is positioned for applications where the S5 CPU needs to drive AC coils, small contactors, indicator beacons, solenoid valves, or other loads that exceed the current/voltage envelope of a semiconductor DO, or where electrical isolation between logic and load is mandatory.The 6ES5452-8MR11 is explicitly targeted at the compact end of the S5 family: S5-90U, S5-95U, S5-100U local CPUs, as well as the distributed ET 100U and ET 200U stations that hang off S5-115U/135U/155U via Profibus IM interfaces. Its mechanical footprint matches the shorter S5 module form factor used in 90U/100U racks (which have fewer slots and tighter width budgets than a 115U/155U central rack), making it a natural DO choice when a compact CPU rack needs relay isolation without consuming the longer-format modules. Siemens has placed the 6ES5452-8MR11 into “End Product Lifecycle” status with no designated replacement—a common fate across much of the S5 450/451/452 relay-output subfamily—so the module today lives almost entirely in MRO, spare-stocking, and legacy-line extension contexts.Within the S5 452 series, the -8MR11 suffix codes the key traits: “8” = version for S5-90U/95U/100U/ET100U/ET200U, “M” = relay contact output, “R” = floating/isolated, “11” = standard S5 front-connector interface. The 6ES5452-8MR11 shares its electrical DNA with the more densely populated 6ES5451-8MR11 (8 relays in the same footprint), but trades channel count for backplane current savings—useful in 90U/100U racks where the CPU’s 5 V backplane budget is tight and 4 relays are enough for the local panel’s actuator set.

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Description

Technical Specifications

Parameter Name	Parameter Value
Product Model	6ES5452-8MR11
Manufacturer	Siemens
Product Type	Digital Output Module, Relay Contact (SIMATIC S5, 452 Series)
Number of Outputs	4 (SPDT / conversion contact per channel)
Output Voltage Rating	30 V DC / 230 V AC
Resistive Load Current	2.5 A @ 30 V DC, 5 A @ 250 V AC
Inductive Load Current	0.5 A @ 30 V DC, 1.5 A @ 250 V AC
Relay Type	Siemens V23127-D 0006-A402
Switching Frequency	≤ 10 Hz (resistive), derate for inductive
Galvanic Isolation	Yes – optocoupler + relay coil/frame isolation, floating design
Fault Indication	Red LED (no-load / missing load voltage indication)
Compatible Platforms	SIMATIC S5-90U, S5-95U, S5-100U, ET 100U, ET 200U
Ambient Temperature	0 … +60 °C horizontal mounting; 0 … +40 °C vertical
Net Weight	~0.23 kg (230 g)
Lifecycle Status	End Product Lifecycle – discontinued, no replacement designated

Main Features and Advantages

4-channel SPDT relay outputs with floating isolation. Unlike semiconductor DO modules (transistor or triac) that tie the field 0 V to the S5 rack supply, the 6ES5452-8MR11 uses optocoupler-driven electromechanical relays with fully floating contact sides. Each of the 4 relays exposes C / NO / NC terminals, meaning one 6ES5452-8MR11 can switch a pump “run” contact on NO and a “fault” announce on NC simultaneously—something a plain PNP transistor DO cannot do. The floating architecture also protects the S5 backplane from field-side transients: a shorted 230 V AC load or inductive kick from a contactor coil stays on the relay contact side and does not propagate to the S5 bus.30 V DC / 230 V AC load versatility in a compact S5 slot. The 6ES5452-8MR11 straddles two worlds: it can drive 24 V DC solenoid valves (very common in S5-90U machine panels) and also directly switch 230 V AC indicator towers, small single-phase contactors, or heater-band SSR trigger coils—without an interposing interface relay. This dual-voltage rating reduces panel component count in compact cabinets where DIN rail real estate is scarce.Lower backplane current draw vs. the 8-relay sibling. The S5 452 series comes in two densities: -8MR11 (this 4-relay model) and -7LA11 / 451-8MR11 (8-relay variants). Because the 6ES5452-8MR11 drives only 4 relay coils from the S5 5 V backplane, its draw is roughly half that of an 8-relay card. In S5-90U and S5-100U racks where the CPU’s backplane current budget is tight (especially on the older 90U where the PSU is often a 5 A / 24 V combined unit), choosing the 4-relay 6ES5452-8MR11 over an 8-relay card can be the difference between a compliant rack and an overloaded one.SPDT conversion contacts for fail-safe and status wiring. Each relay on the 6ES5452-8MR11 gives both NO and NC, so a single output bit can drive “valve open” on NO while the NC contact feeds a supervisory “valve not open” back to a spare DI, or wires into a safety chain. This is particularly useful in S5-100U local panels controlling pneumatic skids, where the PLC program may be minimal (fewer than 128 I/O total) and every bit of wiring economy matters.Built-in load-supervision LED. The 6ES5452-8MR11 includes a red fault LED that activates when the relay is energized but no load voltage is detected on the contact side—helpful during commissioning to catch wiring omissions (e.g., forgotten jumper from panel 230 V AC feed to the relay C-terminal block) before the machine goes live.MRO reality: discontinued, no replacement, so spare strategy matters. Siemens marked the 6ES5452-8MR11 “End Product Lifecycle” with no替代品. That means for any plant still running S5-90U/100U or ET 200U nodes, the only path is NOS (new old stock), refurbished, or pulling from decommissioned lines. The module’s simplicity—optocoupler + relay driver + S5 bus latch—means a professionally refurbished 6ES5452-8MR11 (relays replaced, contacts burnished, LED tested) performs indistinguishably from original, making it a low-risk spare if sourced from a tester who actually cycles each relay under load.