Siemens SINUMERIK 840D sl 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
torque M
MD1428 $MD_TORQUE_THRESHOLD_X (threshold torque)
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 |n
MD1418 $MD_SPEED_THRESHOLD_MIN (nmin for 'nist<nmin' message)
DB31, ... DBX94.5 (|nact| < nix)
This signal indicates that the actual speed |n
MD1417 $MD_SPEED_THRESHOLD_X (nx for 'nist<nx'message)
DB31, ... DBX94.6 (nact = nsetp)
An indication on the the PLC states that the actual speed n
allowing for the tolerance band set in drive machine data:
MD1426 $MD_SPEED_DES_EQ_ACT_TOL (tolerance band for 'nsoll=nist' message)
and that it is 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)
The drive signals to the PLC that the DC link voltage U
undervoltage warning threshold:
MD1604 $MD_LINK_VOLTAGE_WARN_LIMIT (ZK link undervoltage warning threshold)
DB31, ... DBX95.7 (i
2
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.
28
:
dx
t monitoring) (not 810D)
| is lower than the parameterized threshold
d
| is lower than the set minimum speed n
act
| is lower than the set threshold speed n
act
DC link
t monitoring has been initiated.
2
Basic logic functions: Various NC/PLC interface signals and functions (A2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
has reached the new setpoint
act
has fallen below the DC link
:
min
:
x