For the connection of intrinsically safe digital equipment from the Ex field
4 DI NAMUR
4 digital inputs in 4 channel modules (single-channel isolation)
Connectable encoder in accordance with DIN EN 60947-5-6 and NAMUR, optionally with wired or unwired mechanical contacts
Programmable diagnostics and diagnostic interrupt
SIPLUS extreme products are based on SIMATIC standard products. The contents listed here were taken from the respective standard products. SIPLUS extreme specific information was added.
The following intrinsically-safe equipment can be connected to Ex digital input modules:
No. of channels
Connectable intrinsically-safe equipment
Initiators to DIN 19 234 (NAMUR), wired contacts
The Ex digital input modules have the following mechanical features:
The rugged plastic housing contains:
Green LEDs for each circuit to indicate “1” signal (contact closed or I > 2.1 mA with NAMUR encoders to DIN 19234)
Red LED for each circuit to indicate wire break or short circuit
Slot for front connector and cable guide, protected by the front cover
Labeling area on the front cover.
The module is mounted on the DIN rail and connected to the adjacent modules via bus connectors.
There are no slot rules; the addresses of the inputs are predetermined by the slot.
The modules are wired by means of a plug-in front connector. When they are first plugged in, a coding element clicks into place so that the connector will only fit into modules of the same type. The front connector contains a special barrier for covering the module’s 24 V load current supply. When the module is replaced, the front connector can be used in its fully wired state for the new module of the same type.
Ex digital input modules convert the level of the external binary signals of the intrinsically-safe equipment from the Ex field into the internal signal level of the PLC.
SIPLUS S7-300 SM 321 4DI NAMUR
Load voltage L+
● Rated value (DC)
● Reverse polarity protection
from load voltage L+ (without load), max.
from backplane bus 5 V DC, max.
Type of output voltage
via the inputs
Power loss, typ.
Number of NAMUR inputs
● Rated value (DC)
8.2 V; from internal power circuit supply
● on wire-break, max.
● on short-circuit, max.
for NAMUR encoders
— for signal “0”
0.35 to 1.2 mA
— for signal “1”
2.1 to 7 mA
Input delay (for rated value of input voltage)
● Input frequency (with a time delay of 0.1 ms), max.
for NAMUR inputs
Yes; 0.1 / 0.5 / 3 / 15 / 20 ms (plus 0.25 ms preparation time)
● unshielded, max.
● NAMUR encoder
Yes; Two-wire connection
● Diagnostic information readable
Diagnostics indication LED
● Group error SF (red)
● Status indicator digital input (green)
● Channel fault indicator F (red)
Module for Ex(i) protection
Maximum values of input circuits (per channel)
● Co (permissible external capacity), max.
● Io (short-circuit current), max.
● Lo (permissible external inductivity), max.
● Po (power of load), max.
● Uo (output no-load voltage), max.
Potential separation digital inputs
● Potential separation digital inputs
● between the channels, in groups of
Standards, approvals, certificates
Yes; File E239877
Yes; CofC 3028431
RCM (formerly C-TICK)
EAC (formerly Gost-R)
Use in hazardous areas
● Test number KEMA
10 ATEX 0062X
Ambient temperature during operation
0 °C; = Tmin
60 °C; = Tmax
Ambient temperature during storage/transportation
Altitude during operation relating to sea level
● Ambient air temperature-barometric pressure-altitude
Tmin … Tmax at 1080 hPa … 795 hPa (-1000 m … +2000 m) // Tmin … (Tmax – 10K) at 795 hPa … 658 hPa (+2000 m … +3500 m) // Tmin … (Tmax – 20K) at 658 hPa … 540 hPa (+3500 m … +5000 m)
● With condensation, tested in accordance with IEC 60068-2-38, max.
100 %; RH incl. condensation / frost (no commissioning in bedewed state), horizontal installation
Use in stationary industrial systems
— to biologically active substances according to EN 60721-3-3
Yes; Class 3B2 mold, fungus and dry rot spores (with the exception of fauna); Class 3B3 on request
— to chemically active substances according to EN 60721-3-3
Yes; Class 3C4 (RH < 75%) incl. salt spray according to EN 60068-2-52 (degree of severity 3). The supplied connector covers must remain on the unused interfaces during operation!
— to mechanically active substances according to EN 60721-3-3
Yes; Class 3S4 incl. sand, dust. The supplied connector covers must remain on the unused interfaces during operation!