• Siemens SIMATIC S7-1500 Digital Input Modules SM 521 (incl. SIPLUS)
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Siemens SIMATIC S7-1500 Digital Input Modules SM 521 (incl. SIPLUS)

Siemens SIMATIC S7-1500 Digital Input Modules SM 521 (incl. SIPLUS)

SM 521 digital input modules for SIMATIC S7-1500 and ET 200MP in BA, ST, HF and HS versions, including SIPLUS extreme variants.

Key features

  • 16, 32 or 64 channels; 24 V DC, 24-125 V UC, 230 V AC and NAMUR versions
  • HF modules with diagnostics, hardware interrupts and counter inputs
  • 25 mm wide BA modules supplied with push-in front connector
  • 35 mm modules: order front connector (screw or push-in) separately
  • SIPLUS versions for extended temperature and harsh environments

Specifications

Brand Siemens
Product line SIMATIC S7-1500
Category PLC I/O Modules
Series SIMATIC S7-1500 / ET 200MP
Variants listed 15
Source Siemens Catalog ST 70 · 2026, p. 873-898
6ES7521-1BH00-0AB0 Type: DI 16x24VDC HF | Channels: 16 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1BL00-0AB0 Type: DI 32x24VDC HF | Channels: 32 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-7BH00-0AB0 Type: DI 16x24VDC HS | Channels: 16 (groups of 8) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1BP00-0AA0 Type: DI 64x24VDC SNK/SRC BA | Channels: 64 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1BH50-0AA0 Type: DI 16x24VDC BA, sourcing | Channels: 16 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1FH00-0AA0 Type: DI 16x230VAC BA | Channels: 16 (groups of 4) | Input voltage: 230 V AC | Width: 35 mm | Version: Standard
6ES7521-7EH00-0AB0 Type: DI 16x24...125VUC HF | Channels: 16 (groups of 1) | Input voltage: 24...125 V UC | Width: 35 mm | Version: Standard
6ES7521-7TH00-0AB0 Type: DI 16xNAMUR HF | Channels: 16 (groups of 8) | Input voltage: NAMUR 8.2 V | Width: 35 mm | Version: Standard
6ES7521-1BH10-0AA0 Type: DI 16x24VDC BA | Channels: 16 (groups of 16) | Input voltage: 24 V DC | Width: 25 mm | Version: Push-in front connector incl.
6ES7521-1BL10-0AA0 Type: DI 32x24VDC BA | Channels: 32 (groups of 16) | Input voltage: 24 V DC | Width: 25 mm | Version: Push-in front connector incl.
6AG1521-1BH00-7AB0 Type: SIPLUS DI 16x24VDC HF | Channels: 16 | Input voltage: 24 V DC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-1BL00-7AB0 Type: SIPLUS DI 32x24VDC HF | Channels: 32 | Input voltage: 24 V DC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-1BH50-7AA0 Type: SIPLUS DI 16x24VDC BA | Channels: 16 | Input voltage: 24 V DC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-1FH00-7AA0 Type: SIPLUS DI 16x230VAC BA | Channels: 16 | Input voltage: 230 V AC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-7EH00-7AB0 Type: SIPLUS DI 16x48...125VUC HF | Channels: 16 | Input voltage: 48...125 V UC | Width: 35 mm | Version: SIPLUS extreme
PLC I/O ModulesSiemens
15 product codes available in this family
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Siemens SIMATIC S7-1500 Digital Input Modules SM 521 (incl. SIPLUS)

Brand Siemens·PLC I/O Modules

Available part numbers (15)

6ES7521-1BH00-0AB0, 6ES7521-1BL00-0AB0, 6ES7521-7BH00-0AB0, 6ES7521-1BP00-0AA0, 6ES7521-1BH50-0AA0, 6ES7521-1FH00-0AA0, 6ES7521-7EH00-0AB0, 6ES7521-7TH00-0AB0, 6ES7521-1BH10-0AA0, 6ES7521-1BL10-0AA0 + 5 more — see full table ↓

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Product codes & specifications
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Product codeSpec
6ES7521-1BH00-0AB0Type: DI 16x24VDC HF | Channels: 16 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1BL00-0AB0Type: DI 32x24VDC HF | Channels: 32 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-7BH00-0AB0Type: DI 16x24VDC HS | Channels: 16 (groups of 8) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1BP00-0AA0Type: DI 64x24VDC SNK/SRC BA | Channels: 64 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1BH50-0AA0Type: DI 16x24VDC BA, sourcing | Channels: 16 (groups of 16) | Input voltage: 24 V DC | Width: 35 mm | Version: Standard
6ES7521-1FH00-0AA0Type: DI 16x230VAC BA | Channels: 16 (groups of 4) | Input voltage: 230 V AC | Width: 35 mm | Version: Standard
6ES7521-7EH00-0AB0Type: DI 16x24...125VUC HF | Channels: 16 (groups of 1) | Input voltage: 24...125 V UC | Width: 35 mm | Version: Standard
6ES7521-7TH00-0AB0Type: DI 16xNAMUR HF | Channels: 16 (groups of 8) | Input voltage: NAMUR 8.2 V | Width: 35 mm | Version: Standard
6ES7521-1BH10-0AA0Type: DI 16x24VDC BA | Channels: 16 (groups of 16) | Input voltage: 24 V DC | Width: 25 mm | Version: Push-in front connector incl.
6ES7521-1BL10-0AA0Type: DI 32x24VDC BA | Channels: 32 (groups of 16) | Input voltage: 24 V DC | Width: 25 mm | Version: Push-in front connector incl.
6AG1521-1BH00-7AB0Type: SIPLUS DI 16x24VDC HF | Channels: 16 | Input voltage: 24 V DC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-1BL00-7AB0Type: SIPLUS DI 32x24VDC HF | Channels: 32 | Input voltage: 24 V DC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-1BH50-7AA0Type: SIPLUS DI 16x24VDC BA | Channels: 16 | Input voltage: 24 V DC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-1FH00-7AA0Type: SIPLUS DI 16x230VAC BA | Channels: 16 | Input voltage: 230 V AC | Width: 35 mm | Version: SIPLUS extreme
6AG1521-7EH00-7AB0Type: SIPLUS DI 16x48...125VUC HF | Channels: 16 | Input voltage: 48...125 V UC | Width: 35 mm | Version: SIPLUS extreme

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