Siemens S7-300 - Page 100

Machine and cam data
9.14 Cam data
FM 352 electronic cam controller
100 Operating Instructions, 05/2011, A5E01071724-03
Cam start (NA)/Cam end (NE) for time-based cam
Address
relative
Name Type Initial value Comment
of time cams
+2.0
+6.0
CBEGIN
CEND
DINT
DINT
L#-100000000
L#100000000
Cam start (NA)
Cam end (NE)
Activation time
Range:
(0 to 13421) x 100 µs with up to 16 cams
(0 to 26843) x 100 µs with up to 32 cams
(0 to 53686) x 100 µs with up to 64 cams
(0 to 65535) x 100 µs with up to 128 cams
With a time-based cam, you must specify a cam start and an activation time in place of the cam end.
You can set a resolution of 100 µs for the activation time. The time runs starting with the activation of
the cam.
Conditions of setting default times:
 0 µs: A cam with 0 µs activation time is never activated
 0 µs < t ≤ 400 µs: The FM 352 sets a minimum cam activation time of approx. 330 µs.
 t > 400 µs: FM 352 calculates the actual activation time t
act
based on the default activation time
t
def
according to this formula:
W
W LQWHJHU &DPF\FOHWLPH
&DPF\FOHWLPH
DFW
GHI

The maximum error is always less than the cam cycle time.