1794-OE12 — FLEX I/O 12-Channel Analog Output Module

The 1794-OE12 is a 12-channel analog output module for the 1794 FLEX I/O system, with each channel independently configurable for voltage (0–10V, ±10V) or current (0–20 mA, 4–20 mA) output. Twelve channels in one module slot keeps high analog point counts manageable in distributed I/O nodes serving multiple process loops, drive speed references, or valve positioner setpoints from a single physical location.

Specifications

Parameter	Value
Part Number	1794-OE12
Platform	FLEX I/O (1794)
Output Channels	12
Voltage Ranges	0–10V, ±10V
Current Ranges	0–20 mA, 4–20 mA
Resolution	16-bit
Channel Isolation	Not isolated — channels share common
External Loop Supply	24V DC (user-supplied, for current mode)
Operating Temperature	0°C to 55°C

Twelve Channels, One Slot

Process and motion applications with many analog output points — multiple drive speed references on a multi-axis machine, a bank of valve positioners on a process skid, or setpoint signals distributed across several instrument loops — quickly accumulate output module count if each module only covers a handful of channels. The 1794-OE12's twelve-channel density reduces the FLEX I/O node's physical footprint and slot count for these applications, important in distributed installations where the node itself is mounted close to the field devices in a compact enclosure.

Because each channel configures independently for voltage or current mode, a single module can mix output types — some channels driving 4–20 mA valve positioners while others provide 0–10V speed references to nearby drives, all from one module without needing separate hardware for each signal type.

FAQ

Q: Can mixed signal types be assigned across the 12 channels?

Yes. Each channel is configured independently — voltage and current modes can be freely mixed across the module's 12 outputs based on what each connected field device requires.

Q: Does the module provide loop power for current-mode channels?

No. An external 24V DC loop supply must be connected via the terminal base for channels configured in current mode — the module reads and controls the loop current but doesn't source the supply voltage itself.

Q: Since the channels aren't isolated, what's the risk with mixed-vendor field devices?

Connecting devices with different ground references to a non-isolated module can introduce common-mode noise or offset errors. If field devices come from electrically separate systems, individual signal isolators between the device and the module are recommended.

Q: What happens to outputs if the FLEX I/O network connection is lost?

Output behavior on connection loss is configurable per channel — typically hold last value or go to a defined fail-safe value — set according to each connected device's safe-state requirement.

1794-OE12 New Sealed 1794OE12 Ser A Flex I/O 12-Channel Analog Output Module