When your Micro800 application outgrows its onboard I/O—more temperature sensors, more analog process signals, more discrete outputs to drive—the expansion bus is where you go next, and how you fill that bus matters. The wrong module choice means buying extra hardware, consuming extra slots, or writing PLC code to compensate for what the module should have handled in the first place. The right one means a lean panel, a clean program, and room to grow.
HESCO carries Spectrum Controls' full line of 2085 Expansion I/O modules, built specifically for the Micro800 platform and fully licensed by Rockwell Automation. Every purchase includes access to Rockwell TechConnect phone support at no additional cost, a meaningful differentiator when you're commissioning a system on a deadline. This article covers the complete 2085 lineup: what each module does, where it fits, and how to match it to your application. If you're new to the difference between plug-in and expansion I/O, start with our Plug-In vs. Expansion I/O overview, then come back here. For Spectrum Controls' 2080sc plug-in options, see this article.
The short version: the 2085 expansion lineup covers analog inputs (universal, high-density current, high-density voltage, RTD, thermocouple, and combo I/O), analog outputs, and high-density discrete outputs—all at 16-bit resolution and all configurable through Connected Components Workbench (CCW). Whether you're monitoring furnace temperatures, controlling valve actuators, or building a high-point-count discrete output panel, there's a 2085 module designed for it.
Why the 2085 Expansion Lineup Stands Out
Before getting into individual modules, it's worth naming the common thread: every 2085 module is engineered to maximize I/O density while keeping cost per point low. Spectrum Controls positioned this line explicitly around the economics of expansion, with fewer modules to buy, fewer slots consumed, and less PLC code needed (because range scaling and alarm detection happen at the module level, not in ladder logic). All modules share a -20°C to +65°C operating range and carry UL/cUL, CE, FCC Part 15, RoHS, and REACH certifications.
Analog Input Modules
2085sc-IF8U: 8-Channel Universal Analog Input
The IF8U is the flexible workhorse of the lineup. Each of its eight differential inputs can be independently configured for current (0–20 mA, 4–20 mA), voltage (±50 mV, ±100 mV, 0–5 V, 0–10 V, ±10 V), thermocouple (Types J, N, T, K, E, S, R, C, B), RTD (12 types across Pt, Ni, Cu, and NiFe families), or resistance (0–150 Ω to 0–3000 Ω). That flexibility makes it ideal for mixed-signal panels where standardizing on a single module type is more practical than stocking multiple dedicated cards. Find it on our webstore here.
Key specs at a glance:
16-bit resolution delivers the measurement precision most process applications require, whether you're reading a 4–20 mA pressure transmitter or a Pt100 RTD.- Configurable input filters at 4 Hz, 17 Hz, 62 Hz, and 470 Hz. The two lower settings include 50/60 Hz rejection, which matters in electrically noisy industrial environments.
- 139 ms update rate per channel at the 17 Hz filter setting, appropriate for most process monitoring applications.
- 10 VDC channel-to-channel isolation via differential inputs, reducing ground loop interference in multi-sensor setups.
2085sc-IF16V / 2085sc-IF16C: 16-Channel High-Density Analog Input
When you need more analog inputs without consuming more slots, the IF16V (voltage) and IF16C (current) deliver 16 differential inputs in a single expansion module, the highest analog input density available on the Micro800 platform. The IF16C handles 0–20 mA and 4–20 mA signals; the IF16V covers 0–5 V, 0–10 V, and ±10 V. Both run at 16-bit resolution with a 138 ms per-channel update rate.
A notable engineering advantage: range scaling of input data happens inside the module, not in the PLC program. That keeps your ladder logic cleaner and your scan time lower, which matters when you're managing 16 channels on a small controller.
2085-IR8-SC: 8-Channel RTD Analog Input
The IR8-SC is the dedicated RTD module for applications where temperature measurement accuracy and long-term stability are non-negotiable—heat treat ovens, extruders, or HVAC control panels. It supports 12 RTD types (Pt385, Pt3916, Ni618, Ni672, Cu426, NiFe518) and four raw resistance ranges, configurable per channel. Find it on our webstore here.
- 2-, 3-, or 4-wire RTD configurations are all supported, giving you flexibility to match existing field wiring.
- Dedicated RTD circuitry—rather than a universal front end—provides lower long-term drift compared to multi-purpose modules, which matters in applications where calibration intervals are long.
- Update rate note: 139 ms per channel in 2- and 4-wire mode; periodically doubling that in 3-wire mode due to the compensation measurement cycle.
2085-IT8-SC / 2085-IT16-SC: 8/16-Channel Thermocouple Analog Input
For thermocouple-heavy applications like combustion systems, kilns, and injection molding machines, the IT8-SC and IT16-SC provide dedicated thermocouple inputs at 8 or 16 channels respectively. Both support Types J, N, T, K, E, S, R, C, and B, plus ±50 mV and ±100 mV voltage ranges for non-thermocouple millivolt signals. Differential inputs provide 10 V of channel-to-channel isolation, and open-circuit detection is configurable per channel so a broken thermocouple wire triggers a fault instead of a phantom reading. Find the IT8-SC and IT16-SC on our webstore.
Combo and Output Modules
2085-IF4XOF4-SC: 4-Channel Combo Analog Input & Output
The IF4XOF4-SC is built for PID loops and closed-loop control applications where inputs and outputs need to live in the same module. Four analog inputs and four analog outputs share a single expansion slot, with configurable current and voltage ranges on both sides (0–20 mA, 4–20 mA, 0–5 V, 0–10 V, ±10 V). It's a natural fit for single-axis motion assist, valve positioner control, or any application where pairing a sensor reading with a proportional output is the core function. Find it on our webstore here.
2085sc-OF8: 8-Channel High-Density Analog Output
The highest-density analog output available for Micro800 controllers, the OF8 provides eight independently configurable voltage and current outputs in one slot. Output ranges include 0–20 mA, 4–20 mA, 0–5 V, 0–10 V, and ±10 V at 16-bit resolution. Configurable output fault detection and range scaling are handled at the module level, and range alarms with latches are supported—useful for driving actuators where out-of-range output conditions need to be logged, not just cleared. Find it on our webstore here.
Discrete Output Module
2085-OV32-SC / 2085-OB32-SC: 32-Point 24V Sink/Source Discrete Output
At 32 discrete output points per slot, the OV32-SC (sinking) and OB32-SC (sourcing) are the highest-density discrete output options on the Micro800 expansion bus. Each module organizes its outputs into two isolated groups of 16, with individual LED indicators per point and brownout detection for the full module. Working voltage is 12/24 VDC (10.5–30 VDC), and on-state current is 0.5 A steady state per output, with 8 A per channel group. Find the OB32-SC on our webstore here.
The slot efficiency is the key selling point here: a Micro870 can accept up to eight of these modules on its expansion bus, putting 256 discrete output points in a remarkably compact footprint.
Putting It All Together
The 2085 expansion lineup gives Micro800 users a complete, high-density I/O toolkit, from universal analog inputs that eliminate module proliferation, to dedicated temperature modules with the precision accuracy demanding applications require, and 32-point discrete outputs that make high-count panels practical. Every module is configured through CCW, carries full agency certifications, and includes Rockwell TechConnect support through Spectrum Controls' technology partner agreement.
Ready to specify your next Micro800 expansion build? Contact the HESCO team; we'll help you match the right 2085 modules to your application, check availability, and get you what you need to keep the project moving.
