SIMATIC S7-400 6ES7421-7DH00-0AB0

The SIMATIC S7-400 (model 6ES7421-7DH00-0AB0) is a highly reliable digital output module designed for advanced automation applications. With a rated voltage of 24V DC and an input current of 150 milliamperes, it ensures consistent power delivery and efficient performance. The unit operates within a frequency range of 50/60 Hz and features a low power loss of 8 watts for energy efficiency. Built with robust isolation capability (1500V AC) and IP20 protection, it is ideal for industrial environments with up to 95% humidity tolerance. The device functions seamlessly in temperatures ranging from -20C to +60C and is engineered for rack-mounted configurations, offering easy installation. Its compact design with dimensions of 25 x 290 x 210 mm and lightweight construction (600 grams) ensures user-friendly handling. The black finish adds a sleek appearance, complementing its durable build quality. Perfect for automated processes, the SIMATIC S7-400 guarantees precision and reliability in industrial systems.

General Information

• Product Type: SM 421 Digital Input Module

• Number of Digital Inputs: 16

• Simultaneously Controllable Inputs: 16

• Input Voltage: AC/DC, 2460 V UC (4763 Hz)

Electrical Specifications

• Input Current from Backplane Bus (5 V DC): Max 150 mA

• Input Current for Signal 1: Typ 4 mA (range 410 mA)

• Input Delay (Standard Inputs, Rated Voltage): 0.5 / 3 / 10 / 20 ms, parameterizable

• Power Loss: Typ 8 W (3.5 W @ 24 V, 6.5 W @ 48 V, 8 W @ 60 V)

Input Signal Levels

• Signal 0: -6 to +6 V DC / 0 to 5 V AC

• Signal 1: 1572 V DC, -15 to -72 V DC, 1560 V AC

Encoder Connection

• Fixed Current Limitation for Wire-Break Monitoring:

  • Min: 18 k (24 V), 39 k (48 V)

  • Max: 56 k (60 V)

• Connectable Encoders: 2-wire sensor

• Permissible Quiescent Current (2-wire sensor): Max 0.5 mA (0.52 mA)

Cable Length

• Shielded: Max 1,000 m

• Unshielded: Max 600 m (100 m for 0.5 ms, 600 m for 3/10/20 ms)

Diagnostics & Status

• Diagnostics Function: Yes, parameterizable

• Diagnostic Alarm: Yes, parameterizable

• Hardware Interrupt: Yes, parameterizable

• Diagnostic Information Readable: Yes

• Wire-Break Detection: I > 0.7 mA

• Status LED: Green (digital input)

• Channel Fault LED: No

Potential Separation

• Between Channels: Yes, in groups of 1

• Between Channels and Backplane Bus: Yes

Isolation

• Tested With: 1,500 V AC

Dimensions & Weight

• Width: 25 mm

• Height: 290 mm

• Depth: 210 mm

• Weight: Approx. 600 g

Technical Details 

FAQs of SIMATIC S7-400 6ES7421-7DH00-0AB0: