Operation Theory
117
4.4.2 Feedback position counter
The card has a 28-bit binary up/down counter managing the
present position feedback for each axis. The counter counts signal
inputs from the EA and EB pins.
It accepts two kinds of pulse inputs: Plus and minus pulse inputs
(CW/CCW mode), and; 90° phase shifted signals (AB phase
mode). The 90° phase shifted signals maybe multiplied by a factor
of 1, 2 or 4. 4x AB phase mode is the most commonly used in
incremental encoder inputs. For example, if a rotary encoder has
2000 pulses per phase (A or B phase), then the value read from
the counter is 8000 pulses per turn or –8000 pulses per turn
depending on its rotating direction. These input modes can be
selected using the
_8164_set_pls_iptmode()
function.
In cases where the application has not implemented an encoder, it
is possible to set the feedback counter source to generate the out-
put pulses, just as with the command counter. Thus, the feedback
counter and the command counter will have the same value. To
enable the counters to count the number of pulses inputted, set
the “Src” parameter of the software function
_8164_set_feedback_src()
to
1
.
Plus and Minus Pulses Input Mode (CW/CCW Mode)
The pattern of pulses in this mode is the same as the
Dual
Pulse Output Mode
in the Pulse Command Output section;
except that the input pins are EA and EB.
In this mode, pulses from EA cause the counter to count up,
whereas EB caused the counter to count down.
90° phase difference signals Input Mode (AB phase Mode)
In this mode, the EA signal is a 90° phase leading or lagging in
comparison with the EB signal.
Lead
or
lag
of phase difference
between two signals is caused by the turning direction of the
motor. The up/down counter counts up when the phase of EA
signal leads the phase of EB signal.
Summary of Contents for MPC-8164
Page 4: ......
Page 12: ......
Page 14: ...2 Introduction Figure 1 1 PCI 8164 block diagram ...
Page 50: ...38 Installation ...
Page 70: ...58 Signal Connections ...
Page 74: ...62 Signal Connections 3 17 1 Isolated input channels 3 17 2 Isolated output channels ...
Page 75: ...Signal Connections 63 3 17 3 Example of input connection ...
Page 76: ...64 Signal Connections 3 17 4 Example of output connections ...
Page 109: ...Operation Theory 97 ...
Page 110: ...98 Operation Theory ...
Page 111: ...Operation Theory 99 ...
Page 112: ...100 Operation Theory ...
Page 113: ...Operation Theory 101 ...
Page 148: ...136 Operation Theory Users can use this function to check if auto trigger is running Results ...
Page 280: ...268 Connection Example Figure 7 2 Connection of PCI 8164 with Panasonic Driver ...
Page 287: ...Connection Example 275 7 3 3 Mechanical Dimensions ...
Page 297: ...Connection Example 285 7 5 2 Mechanical Dimensions ...
Page 300: ...288 Connection Example 7 6 Wiring with DIN 814M J3A ...
Page 304: ...292 Connection Example 7 7 Wiring with DIN 814Y ...
Page 308: ...296 ...