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Siemens 6ES7421-7BH01-0AB0
SIMATIC S7-400, digital input SM 421, isolated 16 DI; 24 V DC with 0.05 ms input delay alarm, diagnostics
- MPN
- 6ES7421-7BH01-0AB0
- Category
- SM 421 digital input module
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- 12-month warranty (new) · 3-month (used/refurbished)
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What is the Siemens 6ES7421-7BH01-0AB0?
SIMATIC S7-400, digital input SM 421, isolated 16 DI; 24 V DC with 0.05 ms input delay alarm, diagnostics
Specifications
Supply voltage
| Load voltage L+ — Rated value (DC) | 24 V |
| Load voltage L+ — permissible range, lower limit (DC) | 20.4 V |
| Load voltage L+ — permissible range, upper limit (DC) | 28.8 V |
| Load voltage L+ — Reverse polarity protection | Yes |
Input current
| from supply voltage L+, max. | 120 mA |
| from backplane bus 5 V DC, max. | 130 mA |
Encoder supply
| Number of outputs | 2 |
| Type of output voltage | L+ (-2.5 V) |
| Short-circuit protection | Yes; Electronic |
| additional (redundant) feed | Yes; possible |
| Output current — Rated value | 120 mA |
| Output current — permissible range, lower limit | 0 mA |
| Output current — permissible range, upper limit | 150 mA |
Power loss
| Power loss, typ. | 5 W |
Digital inputs
| Number of digital inputs | 16 |
| Input characteristic according to IEC 61131 | Type 2 |
| Number of simultaneously controllable inputs — Number of simultaneously controllable inputs | 16 |
| Input voltage — Type of input voltage | DC |
| Input voltage — Rated value (DC) | 24 V |
| Input voltage — for signal "0" | -30 V DC to +5 V DC |
| Input voltage — for signal "1" | 11 V DC to 30 V DC |
| Input current — for signal "0", min. | 6 mA; < 6 mA |
| Input current — for signal "1", typ. | 6 mA; 6 to 8 mA |
| Input delay (for rated value of input voltage) — Input frequency (with a time delay of 0.1 ms), max. | 2 kHz |
| Input delay (for rated value of input voltage) — for standard inputs — parameterizable | Yes |
| Input delay (for rated value of input voltage) — for standard inputs — at "0" to "1", min. | 3 µs; 0.05 / 0.1 / 0.5 / 3 ms |
| Encoder connection — Fixed current limitation for wire-break monitoring, min. | 10 kΩ |
| Encoder connection — Fixed current limitation for wire-break monitoring, max. | 18 kΩ |
| Cable length — shielded, max. | 1 000 m; 1 000 m: 3 ms, 70 m: 0.5 ms, 30 m: 0.1 ms, 30 m: 0.05 ms |
| Cable length — unshielded, max. | 600 m; 600 m: 3 ms; 50 m: 0,5 ms; 20 m: 0,1 ms; 20 m: 0,05 ms |
Encoder
| Connectable encoders — 2-wire sensor | Yes |
| Connectable encoders — 2-wire sensor — permissible quiescent current (2-wire sensor), max. | 3 mA |
Interrupts/diagnostics/status information
| Diagnostics function | Yes; Parameterizable |
| Alarms — Diagnostic alarm | Yes; Parameterizable |
| Alarms — Hardware interrupt | Yes; Parameterizable |
| Diagnoses — Diagnostic information readable | Yes |
| Diagnoses — Monitoring the supply voltage | Yes |
| Diagnoses — Wire break | Yes; I < 1 mA |
| Diagnostics indication LED — Rated load voltage PWR (green) | Yes; Per group |
| Diagnostics indication LED — internal fault INTF (red) | Yes |
| Diagnostics indication LED — external fault EXTF (red) | Yes |
| Diagnostics indication LED — Status indicator digital input (green) | Yes |
| Diagnostics indication LED — Channel fault indicator F (red) | No |
Potential separation
| Potential separation digital inputs — between the channels | Yes |
| Potential separation digital inputs — between the channels, in groups of | 8 |
| Potential separation digital inputs — between the channels and backplane bus | Yes |
Isolation
| Isolation tested with | 500 V DC |
Dimensions
| Width | 25 mm |
| Height | 290 mm |
| Depth | 210 mm |
Weights
| Weight, approx. | 600 g |
Downloads & documentation
Official documents from Siemens, downloaded directly from the manufacturer.
Data sheets & manuals
6ES7421-7BH01-0AB0: frequently asked questions
When can 6ES7421-7BH01-0AB0 be shipped?
6ES7421-7BH01-0AB0 is sourced on request — request a quote and we'll confirm the exact availability and shipping timeline for this specific unit.
Can I pick up 6ES7421-7BH01-0AB0 in person?
Local pickup from our Groningen, Netherlands warehouse may be possible — contact us before ordering to check availability and arrange a collection time.
Is express delivery available?
Yes — mention it when you request a quote for 6ES7421-7BH01-0AB0 and we'll include express shipping options in our reply.
My factory is down and I need this urgently — can you help?
For a critical breakdown, contact us directly at +31 (0)50-7110348 or sales@partnerplc.com — we can look into same-day courier or dedicated taxi/hotshot delivery for 6ES7421-7BH01-0AB0, subject to availability and destination.
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