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PmacEncoderIVarCapture
"Encoder I-Variable 2" Position Capture Control This parameter
determines which signal or combination of signals (and which polarity)
triggers a position capture of the counter for encoder n. If a flag input
(home, limit, or fault) is used, I903 (etc.) determines which flag. Proper
setup of this variable is essential for a successful home search, which
depends on the position-capture function. The following settings may be
used:
Setting
Meaning
0
Software Control
1
Rising edge of CHCn (third channel)
2
Rising edge of Flag n (as set by Flag Select)
3
Rising edge of [CHCn AND Flag n]
4
Software Control
5
Falling edge of CHCn (third channel)
6
Rising edge of Flag n (as set by Flag Select)
7
Rising edge of [CHCn/ AND Flag n]
8
Software Control
9
Rising edge of CHCn (third channel)
10
Falling edge of Flag n (as set by Flag Select)
11
Rising edge of [CHCn AND Flag n/]
12
Software Control
13
Falling edge of CHCn (third channel)
14
Falling edge of Flag n (as set by Flag Select)
15
Rising edge of [CHCn/ AND Flag n/]
Note that several of these values are redundant. To do a software-controlled
position capture, preset this parameter to 0 or 4; when the parameter is then
changed to 8 or 12, the capture is triggered (this is not of much practical
use).
Encoder I-Variable 3" Capture Flag This parameter determines which of
the "Flag" inputs will be used for position capture (if one is used -- see I902
etc.):
Setting
158
Meaning
0
HMFLn (Home Flag n)
1
-LIMn (Negative Limit Signal n)
2
+LIMn (Positive Limit Signal n)
Chapter 7 – Homing, Encoders, and Position Capture