Siemens SINUMERIK 840Di Function Manual page 34

Detailed Description
2.1 NC/PLC interface signals
DB31, ... DBX94.3 (|Md| < Mdx)
This signal indicates that the current torque |M
M
dx
MD1428 $MD_TORQUE_THRESHOLD_X
The threshold torque is entered as a percentage of the current speeddependent torque
limitation.
DB31, ... DBX94.4 (|nact| < nmin)
This signal indicates that the actual speed value |n
n
min
MD1418 $MD_SPEED_THRESHOLD_MIN
DB31, ... DBX94.5 (|nact| < nix)
This signal indicates that the actual speed value |n
:
x
MD1417 $MD_SPEED_THRESHOLD_X
DB31, ... DBX94.6 (nact = nsetp)
It is signaled to the PLC that the actual speed value n
taking into account the tolerance band set in the drive machine datum:
MD1426 $MD_SPEED_DES_EQ_ACT_TOL,
and is still within the tolerance band.
DB31, ... DBX94.7 (variable signaling function) (not 810D)
Using the variable signaling function, it is possible to monitor digitally for any axis any
variable from SIMODRIVE 611 to check if it violates a certain threshold and to signal as an
interface signal to the PLC.
The variable to be monitored is specified with 611D machine data.
DB31, ... DBX95.0 (DC link voltage < warning level)
A message is sent from the drive to the PLC that the DC link voltage U
the DC link undervoltage threshold:
MD1604 $MD_LINK_VOLTAGE_WARN_LIMIT
DB31, ... DBX95.7 (i
The variable signaling function can be used to protect the power section of the SIMODRIVE
611 universal and SIMODRIVE 611 digital drives against continuous overload. The PLC is
signaled for each axis indicating whether the i
The variable to be monitored is specified with 611D machine data.
2-22
:
:
t monitoring) (not 810D)
2
| is less than the assigned threshold torque
d
| is less than the set minimum speed
actual
| is less than the set threshold speed
actual
has reached the new setpoint,
actual
t monitoring has been initiated.
2
Various NC/PLC Interface Signals and Functions (A2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
is smaller than
DClink