WERMA

Werma visual and audible signalling for lean, safe, and connected plants

Werma specializes in industrial signalling and machine status visualization that helps plants cut downtime, shorten response times, and standardize HMI in noisy or complex environments. Below is a buyer-centric guide covering selection, integration, and maintenance so engineering and procurement can specify confidently.

Where signalling adds measurable value

• Shorter mean time to repair through clear status at a distance
• Safer operator workflows with unambiguous colours, flash patterns, and sound profiles
• Lean and OEE initiatives with stack lights feeding andon boards and analytics
• Retrofit visibility on legacy equipment without PLC reprogramming

Core categories and when to use them

• End to end components for controls, IO, and mounting in panel and field applications: industrial automation
• Beacons, horns, sirens, and combination units for machines, conveyors, doors, and evacuation zones: signalling devices
• Modular stack lights with configurable colours, flash, and sound, including IO Link and networked variants: Werma signal tower lights

Engineering selection criteria

Optics and visibility

• Luminous intensity and lens geometry for required viewing distance
• Constant light vs flashing vs EVS random flash to overcome habituation
• Colour sequence per IEC 60073 and site HMI policy
• IP and IK ratings for washdown or impact-prone areas, UV stability for outdoor use

Acoustics and audibility

• Sound pressure level at operator position, not at 1 m in free field
• Tone sets continuous, pulsed, alternating, multi tone for event differentiation
• A weighting for human perception and local exposure limits
• Directionality and mounting height to avoid shadowing

Electrical and control

• Supply voltage variants and inrush profile for shared supplies
• Control interface discrete, IO Link, AS-i, or networked gateways for andon
• Current draw per module, shared commons, and fuse sizing in mixed stacks
• EMC immunity near VFDs and welders

Mechanical and hygiene

• Mounting type tube, base, wall, bracket; vibration resistance on mobile equipment
• Quick-change modules for serviceability and spare part rationalization
• Smooth housings and gasket materials for food or pharma environments

Integration patterns

• PLC direct Use digital outputs with prewired bases and documented current budget.
• IO Link Centralize parameterization colour, flash, intensity, sound; log diagnostics.
• Andon and analytics Feed stack-light states to MES via gateways to quantify stop reasons and response time.
• Legacy retrofit Use power relays or contact monitors to mirror existing machine signals without changing PLC code.

Standardization and maintenance

• Define a plant colour and tone policy with a legend poster at each area.
• Fix a three-tier priority scheme information warning alarm with matching SPL and flash.
• Keep a spare kit per line light modules by colour, sounders, tubes, bases, and seals.
• Schedule quarterly checks viewing distance, lens cleanliness, SPL at point of work, and cable strain relief.

Compliance and documentation

• Keep Declarations of Conformity and test reports on IP IK EMC in the QA pack.
• Record acceptance tests for each machine position with photos and SPL readings.
• For evacuation signalling, align to site safety plan and local regulations.

Why source Werma from Bank of Lamps

Bank of Lamps is a wholesale distributor with EU-wide delivery from a Latvia warehouse, real-time stock, bulk pricing, and consolidated multi-brand shipments. We support engineers and procurement with documentation packs, standardization guidance, and replenishment plans aligned to maintenance windows.