Fixed Setpoint - Siemens SIMOTRAS 6SG7050 Operating Instructions Manual

Function descriptions
9.4.3

Fixed setpoint

See also Section 8, function diagram Sheet G127
The "Fixed setpoint" function can be activated in the "Run" state with the "Enable controllers" signal
applied.
The "Fixed setpoint" function can be input via the binectors selected via indices .01 to .08 of parameter
P430 and via bits 4 and 5 of control word 2 (= bits 20 and 21 of complete control word) (see function
diagram in Section 8 for logic operation).
When the control word method is used, the following operating modes are possible (see also Section
8, Sheet G181):
P649 = 9: The control bits in control word 2 are input bit-serially. The binectors selected via P680
and P681 determine bits 4 and 5 of control word 2 (= bits 20 and 21 of complete control
word), and thus input of the "Fixed setpoint" function.
P649 ≠ 9:
The connector selected via P649 is used as control word 2. Bits 4 and 5 of this word
control the input of "Fixed setpoint".
The "Fixed setpoint" function is input when one or several of the named sources (binectors, bits in
control word) switch to the log. "1" state. In this case, a setpoint selected in parameter P431 is
assigned to each source. If "Fixed setpoint" is input via several sources simultaneously, the associated
setpoints are added (limited to ±200%).
Parameter P432 can be set to define for each possible fixed setpoint source (binector, bit in control
word - logic operation, see block diagram in Section 8) whether or not the ramp-function generator
must be bypassed. When the ramp generator is bypassed, it operates with ramp-up/down times of 0.
Sequence for entering Fixed setpoint function:
The fixed setpoint is injected instead of the main setpoint.
Sequence for cancellation of Fixed setpoint function:
When all the possible sources for injecting the fixed setpoint (binectors, bits in control word) have
changed back to log. "0", the setpoint selected in parameter P433 (main setpoint) is switched through
again.
9.5 Ramp-function generator
See also Section 8, function diagram Sheet G136
NOTE
The following conditions must be fulfilled for the ramp-function generator to work:
− Ramp-function generator enable = 1 (control word 1.bit 4 = 1)
− Enable setpoint = 1 (control word 1.bit 6 = 1)
9-14
SIEMENS AG 6SG7000-0BA76
SIMOTRAS HD Operating Instructions
01.04