Siemens SIMATIC S7-300 Manual page 67

Reference variables generated internally from MD:
Generation of travel per encoder revolution UMWEG
UMWEG = MD11 + MD12 2
Generation of internal measured value factor MWFAKTOR
0
1
3, 4, 13, 14
Activation of software limit switches SEAKT
= –10
= –10
Internal generation of absolute traversing range limits VFBABS
< 1
Verification:
MD9 check
MD8
0
1
MD11, MD12, MD13 check
Permissible measured value factor range:
2
FM 354 Servo Drive Positioning Module
–32
MD10
MWFAKTOR = 1
MWFAKTOR = UMWEG / (4 MD13)
MWFAKTOR = UMWEG / MD13
MD21 MD22
9 9
= +10
9 9
–10 = +10
9 9
+10
9 9
–10 +10
MWFAKTOR
9
10
9
1 10 / MWFAKTOR
MD10 MD18
– – –
0 –
1 4 –
< 4 MD9 mod UMWEG == 0
3, 13 – UMWEG mod MD9 == 0
4, 14 – (MD14 UMWEG) mod MD9 == 0
–14 14
< MWFAKTOR < 2
Defining Parameters of the FM 354
Measured value factor
SEAKT
0 (inactive)
1 (active)
VFBABS
Permissible rotary axis end
(MD23/30 000) (MD23/30 000)
results in MWFAKTOR (see above)
MD9 VFBABS MD9 VFBABS
5-15