Siemens SIMATIC FM 452 Manual page 96

Machine Data and Cam Data
Address Name
(relative)
+2.0 CBEGIN DINT
+6.0 CEND DINT
Minimum Length of a Distance Cam
101 102 103 104 105
CS = CE
CE
CS = cam start; CE = cam end
Figure 8-3 Shortest Cam with the Axis Moving in the Positive Direction
The inactive part of a cam must always have a minimum clearance of four pulses between the cam end
(CE) and cam start (CS).
If CE = CS, the cam is activated for one pulse
Address Name
(relative)
+2.0 CBEGIN DINT
+6.0 CEND DINT
With a time cam, you specify a cam start and an "on time" instead of a cam end. You can specify the on
time in increments of 100 s. The time starts to run when the cam is activated.
The following conditions apply for specifying the times
0 s: A cam with the on time 0 s is never activated.
0 s < t 400 s: The FM 452 sets a minimum cam time of approximately 330 s.
t > 400 s: The FM 452 calculates the actual on time
the following formula:
t = integer
act
The maximum error is always less than one cam cycle period.
8-28
Type Initial Value
L#–100000000
L#100000000
Pulses; calculated from
the encoder signals
106
Shortest cam
CS = 103 and CE = 103
s
Shortest non–active
cam, when CS is
s
CS
greater than CE:
CS = 105 and CE = 101
.
Type Initial Value
L#–100000000
L#100000000
( )
t
spec
Cam cycle time
cam cycle
Comment
For distance cams
Cam start (CS)
Cam end (CE)
Range:
– 1 000 000 000 m to 1 000 000 000 m
Comment
For time cams
Cam start (CS)
Cam end (CE)
On Time
Range:
(0 to 13421) 100 s with a maximum of 16 cams
(0 to 26843) 100 s with a maximum of 32 cams
(0 to 53686) 100 s with a maximum of 64 cams
(0 to 65535) 100 s with a maximum of 128 cams
from the specified on time
t
act
FM 452 Electronic Cam Controller
according to
t
spec
C79000-G7076-C452-04