Siemens S7-300 - 8.4 SM 326; DI 8 x NAMUR

Digital modules
8.4 SM 326; DI 8 x NAMUR
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
105
8.4 SM 326; DI 8 x NAMUR
8.4.1 Properties, front view, wiring diagram and block diagram
Order number
6ES7326-1RF00-0AB0
Properties
SM 326; DI 8 x NAMUR has the following properties:
● SIMATIC S7-Ex digital module
suitable for connecting signals from the Ex area
● 8 single-channel inputs or 4 two-channel inputs, electrically isolated
● Rated input voltage 24 V DC
● Suitable for the following sensors
– In accordance with DIN 19234 and NAMUR (with diagnostic evaluation)
– connected mechanical contacts (with diagnostic evaluation)
● 8 short-circuit-proof sensor supplies, each to one channel, electrically isolated
● Group fault display (SF)
● Safety mode display (SAFE)
● Status display for each channel (green LED)
● Programmable diagnostics functions
● Assignable diagnostic interrupt
● Supports operation in standard and safety mode
Note
The fail-safe performance characteristics in the technical data apply to a proof-test interval of
10 years and a mean time to repair of 100 hours.
Compliance with air gaps and creepage distances in the Hazardous Area
Note
For the digital input module SM 326; DI 8 x NAMUR, supply of L+ / M to maintain air gaps
and creepage distances in the potentially explosive atmosphere in the Hazardous Area has
to take place via the cable guide (order no. 6ES7393-4AA10-0AA0) (see chapter "Special
Features
when Wiring SM 326; DI 8 x NAMUR for Haz
ardous Areas (Page 109)").