Failure And Monitoring Of The Supply Voltages - Siemens SIMATIC S5-95F Manual

Installing and Connecting the Basic System
Example: How to enter the new comparison value 1,280,520 for the cascading counter.
Parameterize the cascading counter in DB1.
Calculate the hexadecimal number of 1,280,520:
IW 38
bin.: 0 0 0 0 0 0 1 0 0 1 1 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0
0
hex.:
Use the programmer to enter the following STL into the programmable controller.
STL
FB11
L KH 0013
T PW 38
L KH 8A08
T PW 36
BE
4.6

Failure and Monitoring of the Supply Voltages

The S5-95F monitors the 24 V DC supply voltage for the onboard I/Os. You can evaluate the status
of these voltages in the diagnostic byte IB 35 (see section 15.8).
Supply Voltage for Onboard I/Os (40-Pin Connector)
We assume that you use the onboard I/Os and that the supply voltage is therefore connected. If
there is no supply voltage at one subunit or at both subunits , the S5-95F responds with a fault
signal. The S5-95F initiates no further reaction.
If you wish to react to a load voltage failure on one or both subunits, you must evaluate IB 35 in
the user program.
Please note that I/O faults with the corresponding system reaction can also be signalled as a result
of a load voltage failure.
Supply Voltage for Counter and Interrupt Inputs (9-Pin Sub D Connector)
If there is no supply voltage for counter or interrupt inputs at one subunit , the S5-95F responds
with a fault signal. The S5-95F initiates no further reaction. If there is no voltage supply at both
subunits, no fault signal is given.
If you wish to react to a load voltage failure on one or both subunits, you must evaluate the
diagnostic byte IB35 in the user program.
Please note that I/O faults with the corresponding system reaction can also be signalled as a result
of a load voltage failure.
4-22
Counter-Register - Cascading Counter
1
1 3
Reaction to "comparison value reached".
Load the new comparison value into the ACCUs and
set the cascading counter.
8 A
Meaning
S5-95F
IW 36
0 8
EWA 4NEB 812 6210-02
0
0