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Weathermatic SLM12-1600 12-zone expansion module, front view showing module housing, connector interface, and labeling indicating SL1600/PL1600 compatibility.

Weathermatic SLM12-1600 12-Zone Expansion Module for SL1600

Brand: Weathermatic
Save 27%
$315.93
$229.05
SKU SLM12-1600
In Stock (2)

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The Weathermatic SLM12-1600 is a 12-zone expansion module designed to extend the capacity of compatible SmartLine and ProLine controllers. Specifically engineered for use with the SL1600 and PL1600 families, this hot‑swappable module adds reliable zone capacity while preserving the controller’s on-site diagnostics and programming capabilities. Install modules in sequence for correct zone numbering; the SL1600/PL1600 automatically recognizes additional modules with no special programming required.

  • Expand capacity by 12 zones — increases a compatible SL1600 or PL1600 controller to support additional valves without replacing the base unit.
  • Hot‑swappable installation — insert or remove the module without powering down the controller; automatic recognition initializes new zones immediately.
  • On-board diagnostics — fault review, on-board multi‑meter, and stored program backtrack help identify open/shorted zones and measure circuit milliamp values.
  • Built-in valve locator — integrated valve locator function assists in identifying and troubleshooting individual solenoids.
  • Advanced review menus — view ET deficits by zone, daily temperature history, maximum run and minimum soak times, and accumulated run-time statistics.
  • Smart watering features — supports programmable rain delay and plant type inputs (preset crop factors and custom values) for precise zone tuning.
  • Designed for professionals — rugged construction and industry-standard compatibility make it suitable for commercial and residential landscapes.

Refer to the included manual and the SL1600/PL1600 installation instructions when fitting modules: modules must be installed sequentially with no gaps to maintain correct zone assignment. For programming, diagnostics, and full feature details consult the Weathermatic SL1600/PL1600 documentation and support resources.

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Frequently Asked Questions

What controllers is the SLM12-1600 compatible with?
The SLM12-1600 is compatible with Weathermatic SL1600 and PL1600 controllers to expand zone capacity by 12.
Can I install the module without turning off the controller?
Yes. The SLM12-1600 is hot‑swappable and can be inserted or removed without removing power; the controller auto-recognizes the module.
What diagnostic tools does this module provide?
Provides fault review, on-board multi‑meter readings, a built-in valve locator, and review menus showing ET deficits and run-time stats.