Description
Core Product Summary (Brand / Model / Key Attributes)
The AutomationDirect F4-16AD-2 is a 16-channel analog voltage input module for the DirectLOGIC DL405 PLC series. It accepts 16 single-ended voltage inputs configurable for 0–5 V or 0–10 V ranges (all channels must use the same range) and converts them with 12-bit resolution.
The module features optical isolation between the analog field circuits and the PLC logic, a removable terminal block for easy installation, and requires 16 discrete input points from the CPU. An external 24 VDC supply (21.6–26.4 VDC) powers the analog circuitry. It is designed for use in DL405 local or remote bases.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product type | 16-channel analog voltage input module |
| Series | DirectLOGIC DL405 |
| Number of channels | 16, single-ended (one common) |
| Input ranges | 0–5 V, 0–10 V (all channels same range) |
| Resolution | 12-bit (1 in 4096) |
| Input impedance | 100 kΩ minimum |
| Isolation | Optical isolation from PLC logic |
| Conversion time | 0.4 ms per channel (module); 2 ms per channel min. (CPU) |
| PLC update | Up to 16 channels per scan (D4-440 / D4-450) |
| Discrete points required | 16 (X) input points |
| Base power (5 V) | 75 mA |
| External power | 21.6–26.4 VDC, 100 mA, Class 2 |
| Operating temperature | 0 to 60 °C (32 to 140 °F) |
| Absolute maximum ratings | 130 VAC / 100 VDC |
Detailed Product Overview
The F4-16AD-2 expands the analog input capacity of a DirectLOGIC DL405 system by providing 16 single-ended voltage input channels. Each channel can be set for either 0–5 V or 0–10 V, but the selected range applies to all channels on the module. The 12-bit converter delivers a resolution of 1 part in 4096 across the chosen full-scale range.
Analog signals are optically isolated from the PLC backplane and CPU logic, protecting the controller from field-side electrical disturbances. A removable terminal block allows the module to be replaced without rewiring. The module occupies 16 discrete input points (X addresses) in the PLC I/O map; these points carry both the 12-bit data value and channel-selection information.
An external 24 VDC power supply (21.6–26.4 VDC) is required to operate the analog front-end circuitry and draws approximately 100 mA. The module itself draws 75 mA from the base 5 V supply. With D4-440 or D4-450 CPUs, all 16 channels can be read in a single PLC scan when programmed appropriately; other CPUs update one channel per scan.
Active low-pass filtering (−3 dB at 20 Hz) helps reduce noise on the input signals. The module can be installed in any slot of a DL405 local or remote base, subject to power-budget and I/O-point limitations of the system.
F4-16AD-2
F4-16AD-2
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| PLC series | DirectLOGIC | Local or remote base |
| CPU support | All CPUs; full 16-channel scan on D4-440 / D4-450 | Programming method affects update rate |
| Discrete points | 16 consecutive X input points | Data + channel-select bits |
| External power | 21.6–26.4 VDC, 100 mA Class 2 | Required for analog circuitry |
| Terminal block | Removable | Field wiring stays with the connector |
| Programming | DirectSOFT software | V-memory mapping for channel data |
Engineering Selection Highlights
- Sixteen single-ended voltage channels maximize analog input density in a single module slot.
- Selectable 0–5 V or 0–10 V ranges cover common industrial transmitter and sensor outputs.
- 12-bit resolution provides adequate precision for most process and machine-control applications.
- Optical isolation protects the PLC from field-side voltage transients and ground loops.
- Removable terminal block simplifies installation, maintenance, and module replacement.
- Compatible with both local and remote DL405 bases when power budget and discrete-point mapping are observed.
- External 24 VDC supply requirement isolates analog power from the PLC logic supply.
Dimensions, Mounting & Connection Notes
The F4-16AD-2 is a standard DL405 I/O module that installs in any available slot of a local or remote base. Field connections are made to a removable terminal block. Separate terminals are provided for the external 24 VDC supply and the 16 analog input channels (plus common). Exact terminal assignments and wiring diagrams are given in the official DL405 Analog Modules user manual. Observe the base power budget (75 mA at 5 V) and ensure the external 24 VDC supply is properly fused and grounded.
FAQ
What is the AutomationDirect F4-16AD-2?
It is a 16-channel analog voltage input module for the DirectLOGIC DL405 PLC series that accepts 0–5 V or 0–10 V signals with 12-bit resolution.
Can each channel be set to a different voltage range?
No. All 16 channels must be configured for the same range (either 0–5 V or 0–10 V).
Does the module require an external power supply?
Yes. An external 21.6–26.4 VDC supply rated at least 100 mA is required to power the analog circuitry.
How many discrete I/O points does it consume?
It requires 16 discrete input (X) points from the CPU.
Is the analog section isolated from the PLC logic?
Yes. The analog inputs are optically isolated from the PLC backplane and CPU.
Can all 16 channels be read in one PLC scan?
Yes, when used with a D4-440 or D4-450 CPU and appropriate programming. Other CPUs update one channel per scan.
What is the operating temperature range?
0 to 60 °C (32 to 140 °F).
Verification & Troubleshooting Notes
Confirm that the external 24 VDC supply is within 21.6–26.4 V and correctly connected before applying power. Verify that the selected voltage range jumper (if present) matches the field signals and that all channels use the same range. Check that the 16 discrete input points assigned to the module are not used by other devices.
If channel data appears incorrect, confirm scaling and data-handling logic in the PLC program (binary vs. BCD conversion, channel-select bit decoding). Inspect the removable terminal block for proper seating and secure wiring. Monitor the module’s contribution to the base 5 V power budget (75 mA).
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