II - DCE FEL ČVUT v Praze

SIMATIC S7 Ex Analog Modules
Notes on the
module
Parameterization
Default settings
Channel groups
3-56
No external voltage supply L+ (24 V) is necessary for the analog input
module SM 331; AI 8 x TC/4 x RTD.
If thermal resistors (e.g. Pt 100) are used for external compensation, connect
them to channel 6 and 7.
If a compensation box is used for external compensation, connect it to
channel 7.
The functions of the analog input module SM 331; AI 8 x TC/4 x RTD are set
with STEP 7 (refer to /231/) or
in the user program with SFCs (refer to /235/).
The analog input module features default settings for integration time,
diagnostic interrupts etc. (see Table 3-21).
These default settings are valid if re-parameterization has not been carried
out via STEP 7.
2 channels each of the analog input module SM 331; AI 8 x TC/4 x RTD are
combined to form a channel group. Parameters can always only be assigned
to one channel group, i.e. parameters which are specified for a channel group
are always valid for both channels of this channel group.
Table 3-31 shows the allocation of channels to channel groups of the analog
input module SM 331; AI 8 x TC/4 x RTD.
Table 3-31 Allocation of analog input channels of the SM 331; AI 8 x TC/4 x RTD
to channel groups
Channel Allocated channel group
Channel 0
Channel group 0
Channel 1
Channel 2
Channel group 1
Channel 3
Channel 4
Channel group 2
Channel 5
Channel 6
Channel group 3
Channel 7
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04