Omron SYSMAC C200H-CT001-V1, Руководство по эксплуатации

Страница: 40 / 110

26
3-1 Operational Flow
Each Special I/O Unit mounted under a C200H PC is assigned a unit number
between 0 and 9. The unit number assigned to the Counter Unit determines the
100 DM words and 10 IR words that will be allocated to it. DM words are used for
Counter Unit parameters; IR words, for command bits and flags. (Refer to 4-1
Data Configuration and Allocation for details.) The following procedure outlines
the steps necessary to operate the Counter Unit.
1, 2, 3... 1. Set the mode selector on the front panel to the desired operating mode,
and then set the DIP switch on the rear panel accordingly. (Refer to 2-1
Switch Settings.)
2. Set the unit number with the selector on the front panel. (Refer to 2-1
Switch Settings.)
3. Using the Programming Console, set data required in the DM area un-
der the unit number.
4. Prepare the user program to operate the Counter Unit using the allo-
cated IR area words and bits.
It is also possible to set parameters and counter values in any data area using
the user program or the Programming Console. This data can then be trans-
ferred to the Counter Unit by using the TRANSFER DATA command bit. (Refer
to page 40 TRANSFER DATA Command.)
3-2 Input Selection
Any one of three types of inputs can be selected: offset phase inputs (i.e., two
inputs with offset phases), individual up and down inputs, and pulse and direc-
tion inputs. All three types of inputs include a reset input. Any type of any input
can be used with any of the operating modes, although not all operating modes
support resetting. (Refer to Section 4 Data allocation and Operating Modes for
details.) The type of inputs is selected with the back panel DIP switch.
3-2-1 Offset Phases
Offset phase inputs use the difference in phase between two inputs to determine
whether the counter value will be incremented or decremented. An input multi-
plier, either x 2 or x 4, is available with offset phase inputs to increase accuracy. If
the x 2 multiplier is selected, the counter value will be incremented or decre-
mented twice for each input A pulse; if the x 4 multiplier is selected, the counter
value will be incremented or decremented four times for each input A pulse. The
multiplier is set with the back panel DIP switch. (Refer to 2-1 Switch Settings.)
The counter can be reset in the linear or circular operating modes by using the
Z-phase output of the encoder. Refer to 3-3 Reset Conditions for details.
Phase A
Phase B
Phase Z (reset input)
Input A
Input B
Input Z
Wire according
to the counting
direction
Encoder
Counter Unit
Counting Speed The maximum pulse frequency possible for offset phase inputs is determined
by the specifications of the incremental encoder connected to the Counter
Input Selection
Section 3-2