Siemens sinumerik 840D sl Function Manual page 287

Further monitoring signals
Machine data MD37550 $MA_EG_VEL_WARNING allows a percentage of the speeds and
accelerations to be specified in the following machine data MD32000 $MA_MAX_AX_VELO
and MD32300 $MA_MAX_AX_ACCEL, with reference to the following axis, which results in
the generation of the following interface signals:
IS "Speed warning threshold" DB31, ... DBX98.5
IS "Acceleration warning threshold" DB31, ... DBX98.5
The monitoring signals can be used as trigger criteria for emergency retraction. See Chapter
"Possible trigger sources".
Machine data MD37560 $MA_EG_ACC_TOL allows a percentage with reference to machine
data MD32300 $MA_MAX_AX_ACCEL of the following axis to be defined, and the IS signal
"axis accelerates" DB31, ... DBX99.3 to be generated.
Request synchronous traverse difference
1. The result of the synchronism difference calculation can be read as an amount in the
• Negative value (in positive traverse direction for lead and following axis): The following
• Positive value (in positive traverse direction for lead and following axis): The following
The amount of the synchronization difference with sign corresponds to the system variables
without sign from $VA_EG_SYNCDIFF.
$VA_EG_SYNCDIFF[ax] = ABS($VA_EG_SYNCDIFF_S[ax])
Block change mode
1. When an EG axis group is activated, it is possible to specify the conditions under which a
2. The specification is made with a string parameter with the following meaning:
3. "NOC": Immediate block change
4. "FINE": Block change if "Fine synchronism" is present
5. "COARSE": Block change if "Coarse synchronism" is present
6. "IPOSTOP": Block change if "Setpoint synchronism" is present
If no block change has been defined for the EG axis group and none is currently specified,
"FINE" applies.
Special functions: Axis Couplings and ESR (M3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
parts program with system variable $VA_EG_SYNCDIFF. The relevant value with sign is
available in the system variables $VA_EG_SYNCDIFF_S. The following meanings apply:
axis lags behind its calculated setpoint position.
axis leads before its calculated setpoint position (overswing).
part program block change is to be executed:
Note
When programmed in activation calls EGON, EGONSYN, EGONSYNE, each of the
above strings can be abbreviated to the first two characters.
Detailed description
2.4 Electronic gearbox (EG)
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