2085-OW16 — Micro800 16-Point Relay Output Expansion Module

The 2085-OW16 is a 16-point relay output expansion module for the Micro800 2085-series I/O expansion bus, compatible with Micro820 and Micro830 controllers. Each output is a Form A (normally open) relay contact rated at 240V AC or 30V DC, 2A, individually isolated from the others. For small controllers whose onboard relay outputs are already committed to other loads, the 2085-OW16 adds a substantial block of voltage-flexible switching capacity in a single expansion slot.

Specifications

Parameter	Value
Part Number	2085-OW16
Platform	Micro800 — 2085 I/O expansion bus
Output Points	16
Contact Type	Form A (Normally Open)
Rated Voltage (AC)	240V AC max
Rated Voltage (DC)	30V DC max
Rated Current	2 A per point (resistive)
Isolation	Point-to-point isolated
Electrical Life (full load)	100,000 operations
Mechanical Life	10 million operations
Compatible Controllers	Micro820, Micro830
Operating Temperature	0°C to 55°C
Standards	UL 508, CE, IEC 61131-2

Why Relay Density Matters on a Small Controller

Micro800 controllers ship with a mix of onboard relay and transistor outputs that often gets fully allocated quickly — a few relays for AC solenoids, a couple for contactor coils, and the transistor outputs reserved for high-cycle 24V DC loads. When a machine needs more AC-switching capacity than the base unit provides, the 2085-OW16 adds sixteen more individually isolated relay points in one expansion slot rather than forcing a jump to a larger controller platform or a separate relay panel.

The point-to-point isolation is the practical advantage over a shared-common relay block: each of the sixteen outputs can switch a completely different voltage or supply reference without any interaction between circuits. A mix of 120V AC pilot lights, 24V DC indicators, and 240V AC solenoid valves can all be wired to the same module, each on its own independent circuit.

Wiring and Load Notes

Each output has its own pair of terminals — no shared common bus across the sixteen points. Wire each circuit independently between its assigned output terminal and the load.
For inductive loads (solenoid coils, contactor coils, relay coils), fit a suppressor — an MOV or RC snubber for AC loads, a flyback diode for DC loads — directly across the load terminals to extend contact life and protect against voltage transients.
The 2085 expansion bus does not support hot-swap. De-energize the system before adding, removing, or replacing this module.
External fusing on each output circuit is recommended for branch protection — the module's relay contacts are not internally fused.

FAQ

Q: How many 2085-OW16 modules can be added to one Micro830 controller?

The 2085 expansion bus supports a defined maximum number of expansion modules per controller, which varies by Micro830 model. Verify the specific controller's expansion limit before planning a system with multiple relay expansion modules.

Q: Can the 16 outputs switch a mix of AC and DC loads simultaneously?

Yes. Because each point is individually isolated, different outputs can switch AC loads while others switch DC loads on the same module, with no interaction between circuits.

Q: Does this module require a 2085-ECR end cap if it's the last module on the bus?

Yes. Any 2085 expansion module installed at the end of the chain requires the 2085-ECR end cap on its right-side connector to properly terminate the bus, regardless of module type.

Q: Is there a higher-current relay output module in the same series for larger loads?

Output current per point on Micro800 expansion relay modules is generally standardized within the series at this rating. For loads exceeding 2A per point, an external interposing relay sized for the higher current is the appropriate solution rather than driving the load directly from the module.

2085-OW16 New Factory Sealed 2085OW16 Output Module