II - DCE FEL ČVUT v Praze

Analog output
Output ranges
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
You can connect the outputs as:
Current outputs
The outputs can be set channel by channel. Output mode is parameterized
with STEP 7.
You can set the various output ranges for current outputs with STEP7.
Table 3-38 shows the possible output ranges of the analog output module
SM 332; AO 4 x 0/4...20 mA.
Table 3-38 Output ranges of analog output module SM 332; AO 4 x 0/4...20 mA
Selected output mode Explanation Output range
Current The digitized analog values are specified in Section 3.1.3, Table 3-20
Current measuring range.
Wire break check
Influence of load
voltage drop on
diagnostic
message
SIMATIC S7 Ex Analog Modules
from 0 to 20 mA
from 4 to 20 mA
The analog output module SM 332; AO 4 x 0/4...20 mA carries out an wire
break check.
Conditions: A minimum output current of 100 A must flow and the
voltage set at the load must be > 12 V in order to signal
wire break.
If the 24 V load voltage drops below the permissible rated range (< 20.4 V)
the output current can be reduced before a diagnostic message is output if a
load of 400 is connected and the output currents are 18 mA.
3-71