Siemens SIMATIC S5-90U, Системное руководство

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S5-90U/S5-95U Function Modules
16.6.5 Entering New Setpoints for the Counter and Position Decoder
Entering new setpoints is always possible via the PIQ. However, a setpoint is only valid if the
respective output is not switched on. The status of the outputs is displayed with diagnostic bits S 1
and S 2.
Diagnostic bit S 1 (bit 1 in the diagnostic byte)=1: setpoint 1 is reached and output 1 is switched
on.
Diagnostic bit S 2 (bit 2 in the diagnostic byte)=1: setpoint 2 is reached and output 2 is switched
on.
Table 16-5. Reaction of the Counter Module during Transfer of the Setpoints
Diag. Bit
S 1 = 0
S 2 = 0
S 1 = 1
S 2 = 1
New setpoint 1 is transferred and is valid immediately.
New setpoint 2 is transferred and is valid immediately.
New setpoint 1 only becomes active if a positive edge has appeared at the enable
input.
New setpoint 2 only becomes active if a positive edge has appeared at the enable
input.
Response
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
Example for the Position Decoder:
You want to control a drive by using the outputs of the counter module. After a run of positioning,
both setpoints are reached and both outputs are turned on. You can enter the new setpoints by
using the following sequence.
Figure 16-26. Requirement for New Setpoints
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
S 2
new
a a a a a a a
a a a a a a a
a a a a a a a
a a a a a a a
S 1
old
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
S 1
new
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
S 2
old
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
a a a a a a a a
Enable
input
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
Output Q 0 /
Diag. bit S 1
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
a a a a a a a a a a a a a a
Output Q 1 /
Diag. bit S 2
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
a a a a a
Transfer the new setpoints to the module. Since both diagnostic bits S 1 and S2 are set to
”1”, the actual values are not yet accepted.
Switch the signal now at the enable input to ”0”. With the falling edge, the outputs are switched
off and the diagnostic bits are reset.
Switch the signal at the enable input again to ”1”. The new setpoints are accepted and are
now active.
After reaching the new setpoints, the respective output is turned on again.
EWA 4NEB 812 6115-02b
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