Agent Supply Original Germany Siemens 6ES7421-7BH00-0AB0 SM421 16-Channel High-Speed Galvanically Isolated Digital Input Module 24VDC For S7-400 PLC
Complete order number: 6ES7421-7BH00-0AB0 (upgraded replacement model: 6ES7421-7BH01-0AB0)
Product model: SM 421 16DI high-speed digital input module
Adaptation system: Siemens SIMATIC S7-400 full series CPU, S7-400H redundant hot standby control system, supporting hot swapping
Origin: Made in Germany
Channel configuration: 16 channels of DC24V digital input, with a set of photoelectric isolation (isolation withstand voltage 1500V AC) every 4 channels, a total of 4 independent isolation circuits, strong anti electromagnetic interference
Rated input voltage: DC24V (allowable range 20.4~28.8V DC)
Signal 0 level: -30V~+5V DC
Signal 1 level: 11V~30V DC
Single channel input current: typically 6mA (range 6-8mA) when signal 1 is present, supporting direct connection of two-wire proximity switches
Core high-speed characteristics: Input filtering delay can be parameterized by software configuration: 0.1ms/0.5ms/3ms; The minimum response is only 3 μ s, which can collect high-speed encoders and high-frequency pulse signals
Cable transmission distance: shielded cables up to 1000m, unshielded cables up to 600m; it is recommended to shorten the wiring distance to reduce signal interference in high-speed mode
Diagnostic function: supports wire breakage detection, grouped fault alarm, hardware diagnostic interruption, and can report sensor wire breakage and circuit abnormal faults in real time
Power supply parameters: load side L+maximum 120mA; backplane 5V maximum consumption 130mA, module typical power consumption 5W
Wiring accessories: A 40 pin front connector (6ES7492-1AL00-0AA0) needs to be separately selected, and the module does not include wiring terminals at the factory
Physical specifications: S7-400 single slot UR rack installation, dimensions 25mm × 290mm × 290mm, net weight approximately 776g
Working environment: 0 ℃~+60 ℃ rack operating temperature, IP20 protection, in compliance with industrial EMC anti-interference standards
Product status: First generation discontinued model, hardware directly compatible with the new version of 7BH01, mostly used for replacing spare parts in old automated production lines
Source status: Siemens authorized agent channel, brand new factory sealed stock, 12-month warranty, supports global bulk ordering for foreign trade