II - DCE FEL ČVUT v Praze

SIMATIC S7 Ex Digital Modules
2.1 Digital Input Module SM 321; DI 4 x NAMUR
Order number
Features
2-2
6ES7 321-7RD00-0AB0
The SM 321; DI 4 x NAMUR offers the following features:
4 inputs
– Isolated with respect to bus
– Isolated among each other
Load voltage 24 V DC
Connectable sensors
– In compliance with DIN 19234 or NAMUR (with diagnostic
evaluation)
– Interconnected mechanical contacts (with diagnostic evaluation)
– Open-circuited mechanical contacts (without diagnostics)
4 short-circuit-proof outputs for sensor power supply (8.2 V)
Operating points: logic ”1” 2.1 mA
logic ”0” 1.2 mA
Status indication (0...3) green LEDs
Fault indication red LEDs for
– Group fault indication (SF)
– Channel-referred fault indication for
short-circuit and wire break (F0 ... F3)
Configurable diagnostics
Configurable diagnostic interrupt
Configurable hardware interrupt
Intrinsic safety of inputs in accordance with EN 50020
2-wire sensor connection
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04