Siemens SINUMERIK 840C - Manual (Page 940)

12.93 12 Functional Descriptions
12.18.13 Start-up
Effect of the input values in NC MD 1432*/495* (case distinction):
0: No controlled follow-up;
immediate normal follow-up
1...15000: Controlled follow-up initially;
switchover to normal follow-up on expiry of delay
15001 and higher: Controlled follow-up at all times
Definition of "Controlled follow-up of following drive":
The following drive attempts to following the movements executed by the leading drive. In this
case, the leading drive actual values act as the reference variables. The following drive
continues to operate under positional control.
Definition of "Follow-up of following drive":
Behaves in the same way as a normal NC drive, i.e. the drive is braked rapidly during traversal
with the maximum braking current. The state of synchronism cannot be maintained in this
case.
On expiry of a time defined in MD 1224* or 447*, the position control loop is opened. From this
point onwards, only the position actual value is recorded.
Service data of following drives
The service data for the following drives are shown in the standard displays of the NC
axes/spindles.
The following axis service data are identical to those of other NC axes/spindles with the
exception of the "Contour monitoring" service display.
The following applies to the "Contour monitoring" service display:
• With IS LINK ACTIVE = 0 signal (i.e. LINK OFF)
The current contour deviation for the following axis is displayed. The display in the
"Synchronism error" field remains at 0.
• With IS LINK ACTIVE = 1 signal:
The contour deviation display remains at 0. In the active link state, the synchronism error
is indicated in the "Synchronism error" field.
The current positional difference between the leading and following axes is entered in the
"Synchronism error" field in the "Individual axes/individual spindles" service display. The
difference is displayed in units (MS).
Checking the GI programming functions
You now need to configure and activate the gearbox grouping. You should also test the "On-
the-fly synchronism" performance of the grouping if necessary. The requisite programming
functions are described in the document entitled "SINUMERIK 840C, Programming Guide".
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–165
SINUMERIK 840C (IA)