Detailed description
2.1 NC/PLC interface signals
Basic logic functions: Various NC/PLC interface signals and functions (A2)
28 Function Manual, 11/2006, 6FC5397-0BP10-2BA0
DB31, ... DBX94.3 (|Md| < Mdx)
This signal indicates that the current torque |M
d
| is lower than the parameterized threshold
torque M
dx
:
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
act
| is lower than the set minimum speed n
min
:
MD1418 $MD_SPEED_THRESHOLD_MIN (nmin for 'nist<nmin' message)
DB31, ... DBX94.5 (|nact| < nix)
This signal indicates that the actual speed |n
act
| is lower than the set threshold speed n
x
:
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
act
has reached the new setpoint
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
DC link
has fallen below the DC link
undervoltage warning threshold:
MD1604 $MD_LINK_VOLTAGE_WARN_LIMIT (ZK link undervoltage warning threshold)
DB31, ... DBX95.7 (i
2
t monitoring) (not 810D)
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
2
t monitoring has been initiated.
The variable to be monitored is specified with 611D machine data.
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