Product Overview
Technical Summary
| Product type | DI 16×24 … 125 V UC HF |
|---|---|
| Digital inputs | 16 |
| Input grouping | 16 channels in groups of 1 |
| Rated input value, DC | 24 V; 48 V, 125 V |
| Rated input value, AC | 24 V; 48 V, 125 V (50 – 60 Hz) |
| Input delay | 0.05 / 0.1 / 0.4 / 1.6 / 3.2 / 12.8 / 20 ms parameterizable with DC, 20 ms fixed with AC |
| Counter channels | 2; Channel 0 and 1 |
| Counting frequency, max. | 6 kHz |
| Front connector | Screw terminals or push-in terminals; ordered separately |
| Power consumption from backplane bus | 1.2 W |
| Product lifecycle | Active Product |
Key Features
16 digital inputs, with 16 simultaneously controllable inputs and parameterizable input functions.
Rated input values are 24 V, 48 V and 125 V DC, or 24 V, 48 V and 125 V AC at 50 – 60 Hz.
For standard inputs, the delay is parameterizable from 0.05 ms to 20 ms with DC; it is fixed at 20 ms with AC.
Counter mode is available from V1.1.0 in DC operation; up to 2 channels, Channel 0 and 1, support a maximum counting frequency of 6 kHz and 32 bit counting width.
The module has a diagnostics function, diagnostic alarm, hardware interrupt, wire-break diagnosis to I < 550 μA, and channel and module status LEDs.
A front connector with screw terminals or push-in terminals is ordered separately. Maximum cable length is 1 000 m shielded or 600 m unshielded.
Frequently Asked Questions
What exact Siemens line item is this?
It is Siemens 6ES7521-7EH00-0AB0, a SIMATIC S7-1500 digital input module designated DI 16×24 … 125 V UC HF.
What input voltages does this module support?
Rated input values are 24 V, 48 V and 125 V DC, or 24 V, 48 V and 125 V AC at 50 – 60 Hz.
How is the counter function configured?
Counter mode is available from V1.1.0 only in DC operation. Up to 2 channels, Channel 0 and 1, support a maximum counting frequency of 6 kHz and 32 bit counting width.
Is the front connector included?
It is without a front connector; the screw-terminal or push-in front connector is ordered separately.
What information should accompany a quotation request?
Include the requested quantity, destination, schedule context and any additional BOM lines with the exact 6ES7521-7EH00-0AB0 line item.
