Reviews & Ratings
This is a digital input module for the SIMATIC S7‑1200 automation platform, designated SM 1221. It provides 16 digital inputs (24 V DC), supporting both sink and source wiring modes—a versatile choice for standard automation tasks
6ES7221-1BH32-0XB0
⚙️ Technical Specifications (per Siemens
datasheet)
|
Feature |
Specification |
|
Channels |
16
digital inputs, grouped in sets of 4 |
|
Voltage
Range |
20.4–28.8 V DC (rated 24 V) |
|
Input
Logic “1”/“0” |
ON:
≥15 V (≈2.5–4 mA); OFF: ≤5 V (≤1 mA) |
|
Input
Delay |
Parameterizable:
0.2–12.8 ms |
|
Power
Consumption |
~2.5 W overall; backplane draws ~130 mA @ 5 V |
|
Max
Cable Length |
300 m unshielded / 500 m shielded |
|
Diagnostics |
Grouped
diagnostics, LED status indicator |
|
Backplane
Isolation |
Channel
groups isolated; overall IP20 rated |
|
Approvals |
CE,
CSA, UL/cUL, FM, RCM, KC, Marine |
|
Operating
Temp |
–20 °C to +60 °C |
|
Storage
Temp |
–40 °C to +70 °C |
|
Dimensions
(W×H×D) |
45 × 100 × 75 mm |
|
Weight |
~210 g |
? Wiring & Configuration
- Supports
both sink (PNP) and source (NPN) sensors
- Input
delays are configurable via TIA Portal, useful for filtering bounces or
debouncing signals
- LEDs
indicate status and diagnostic alarms at group level
✅ Lifecycle & Availability
- Active
product, available worldwide with ~1‑day
lead time
- Standard
stock item (not spare or discontinued), RoHS‑compliant, with typical
Industry approvals
?️ Typical Uses
- Expanding
I/O count on S7‑1200 controllers
- Reading
multiple 24 V
DC signals: sensors, switches, etc.
- Ideal
for industrial automation, control panels, and manufacturing system
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