Siemens 6ES5380-8MA11 SIMATIC S5-380 Timer Module – 2-Channel Hardware Timer 0.3–300 s for S5-90U/95U/100U

Product Overview

The 6ES5380-8MA11 is a SIMATIC S5-380 series hardware timer module manufactured by Siemens, designed as a function-level expansion for S5-90U, S5-95U, S5-100U central racks as well as ET 100U and ET 200U distributed I/O stations. Unlike software-based T-on / T-off timers that execute inside the CPU scan cycle, the 6ES5380-8MA11 implements timing in dedicated hardware silicon, meaning the two independent timer channels run autonomously against an internal clock circuit regardless of CPU load, scan-time drift, or program complexity. This architectural distinction is the module’s defining value: even on a heavily loaded S5-100U where the OB1 cycle stretches to dozens of milliseconds, the 6ES5380-8MA11 continues counting with ±10 % setpoint accuracy and ±3 % reproducibility, with only +1 %/10 °C temperature influence on the set value.Each channel on the 6ES5380-8MA11 covers a base timing range of 0.3 s to 300 s, with ×10 and ×100 range extension factors accessible via parameterization, pushing practical coverage from sub-second pulse work up to several hours of delayed action without consuming a single line of CPU-resident timer resource. The module draws nominally 10 mA from the +9 V backplane supplied by the CPU or IM interface module, and carries a green LED function display per channel for local status verification during commissioning and fault-finding—something pure software timers can never offer on the rack front panel. Physically the 6ES5380-8MA11 conforms to the S5 compact function-module profile at approximately 200 g, 12 V AC rated insulation, 500 V AC tested per insulation group, and IP20 rating for control-cabinet mounting. For plants still running S5 as the active control layer—batch reactors, conveyor interlocks, pump staging, legacy press lines—the module is a targeted fix for applications where software-timer jitter is no longer acceptable and where a CPU upgrade or S7 migration cannot be justified.Within the S5 function-module lineup the 6ES5380-8MA11 sits alongside cousins like the 6ES5385-8MA11 counter, 6ES5330-8MA11 diagnostics, and 6ES5470-8MD11 analog output, all sharing the same mechanical envelope and backplane footprint. Sourcing verified 6ES5380-8MA11 units today is typically a spare-banking exercise: the module was long ago discontinued in favor of S7-1500/ET 200SP equivalents, but thousands of S5 racks worldwide still depend on it, and a missing timer module can stall a line that was commissioned in the 1990s and never migrated.

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Description

Technical Specifications

Parameter	Value
Product Model	6ES5380-8MA11
Manufacturer	Siemens
Product Type	Hardware Timer Module (Function Module)
Series	SIMATIC S5-380
Number of Timer Channels	2, independent
Base Time Range	0.3 s to 300 s per channel
Range Extension Factor	×10, ×100 (parameter-selectable)
Setting Error	±10 % of set value (typical)
Reproducibility	±3 %
Temperature Influence	+1 % / 10 °C on set value
Supply Voltage	+9 V DC (backplane, from CPU/IM)
Current Consumption	10 mA typ. @ +9 V
Function Display	Green LED per channel
Rated Insulation Voltage	12 V AC (insulation group 1B, tested 500 V AC)
Compatible Racks	S5-90U, S5-95U, S5-100U, ET 100U, ET 200U
Operating Temperature	0 °C to +60 °C
Storage Temperature	–40 °C to +70 °C
Protection Class	IP20 (control-cabinet install)
Weight (approx.)	200 g

Main Features and Advantages

Scan-independent hardware timing. The headline advantage of the 6ES5380-8MA11 is that timing is executed in silicon, not in OB1. Standard S5 software timers (T-addresses) increment once per scan, which means a 50 ms nominal TON on a CPU whose scan has stretched to 80 ms due to added logic will actually delay 80 ms per tick—a 60 % error. The 6ES5380-8MA11 bypasses this entirely: once the CPU writes a start command via the process image, the channel’s internal RC/clock circuit runs free, and expiry is reported back to the CPU as a discrete status bit. For applications like conveyor segment staging, pump lead/lag changeover, or anti-rebound delays on press clutches, this hardware discipline removes a whole class of phantom timing bugs that appear only under high load.Dual-channel flexibility with range scaling. Two independent channels in a single 6ES5380-8MA11 consume just one rack slot, and each can be parameterized for on-delay behavior with its own preset and range-factor. Base 0.3–300 s covers everything from short debounce (×1, 0.3 s lower bound avoids the 10 ms granularity that S5 software timers struggle to hit accurately) through medium process waits. Apply ×10 to reach 3,000 s (50 min) or ×100 for 30,000 s (~8.3 h) from the same module without touching firmware. This scaling matters in batch preheat-soak-cool sequences where a single CPU-resident DB and multiple T-words would otherwise be consumed.Front-panel green LED diagnostics. One easily overlooked field advantage: the 6ES5380-8MA11 gives each channel a green LED on the module face. During a midnight call-out on a 30-year-old S5-95U rack, an operator can see at a glance whether Timer 1 is active, expired, or never started—without opening STEP 5, without a PG laptop, without decoding process-image bytes. In legacy plants where the original commissioning engineer retired a decade ago and the .STP file is buried on a dead hard drive, that LED is sometimes the fastest triage tool on the rack.Low backplane load, no external power. The 6ES5380-8MA11 draws only 10 mA from the +9 V backplane already supplied by the S5 CPU or IM interface module—no 24 V terminal wiring, no fuse assignment, no separate power-feed planning. This keeps panel design clean when banking multiple function modules (timer + counter + analog) in a single S5-100U rack. At 200 g and shallow depth, it also avoids the mechanical stress on rack rails that heavier SM/FM modules sometimes introduce in wall-mounted cabinets.Proven durability in 24/7 process. First shipped as part of the S5-90U/95U/100U generation, the 6ES5380-8MA11 has decades of runtime data behind it in water-treatment, bulk-material handling, automotive body-shop conveyors, and food-batch applications. The ±3 % reproducibility figure is conservative for hardware RC-based timing; in stable cabinet ambient (20–35 °C) many units hold better than ±2 %. For MRO buyers, this translates to “install and forget”—the module either works or it doesn’t, with almost no gradual drift failure mode, unlike electrolytic-heavy boards.