Omron CS1W-CT021, Operation Manual

Page: 63 / 201

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Section 3-2
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If you want to use all the available features and functions of the High-speed Coun-
ter Unit you must configure a Counter not as Simple Counter but as Circular or Lin-
ear Counter. For detailed information on Circular and Linear Counters refer to 3-
2-2
"Circular Counter" and 3-2-3 "Linear Counter" .
Simple Counter
Configuration The following features and functions are supported for Simple Counters in a
default configuration:
•
A Simple Counter can count up and down over the full (32-bits) counting range
(comparable to a Linear Counter, refer to 3-2-3
"Linear Counter" ).
•
By using CIO-bits the Counter Value of a Simple Counter can be Preset, Reset
or Captured and the Gate can be Opened or Closed to allow counting pulses
or not.
•
Only Phase Differential (multiplication x1) Signals can be connected to a Sim-
ple Counter. The Z-signal cannot be used to trigger a Reset, only its status is
reported in CIO (and can be used to trigger a reset indirectly via the PLC lad-
der-program).
•
The Noise Filters for the Simple Counter and the Digital Inputs are fixed at 50
kHz. This means that the maximum frequency of the count pulses up to 50
kHz is guaranteed.
•
The Digital Outputs of the High-speed Counter Unit can only be controlled
manually using the corresponding bits in CIO.
•
The Digital Inputs and Outputs can generate Interrupts if Interrupts have been
enabled (in a mixed configuration with Simple/Circular/Linear Counters).
•
The four Digital Outputs use an NPN-Output Driver.
•
The Digital Inputs cannot be assigned to individual Counters and the Function
of the Digital Inputs cannot be configured. Only the status of the Digital Inputs
is reported in CIO. For information on assigning Functions to Digital Inputs for
Circular and Linear Counters refer to 3-4
"Digital Input Functions" .
•
Three IORD/IOWR-commands are supported: read Captured Counter Value
(refer to 4-5-3-1
“Captured Counter Value” ), read/write Counter Value (refer to
4-5-3-3 "Counter Value" ) and write Error Clear Command (refer to 4-5-3-5
"Error Clear Command" ).
•
Errors are normally reported in CIO (refer to 5-2 "Error codes" ).
The following features and functions are not supported for Simple Counters:
•
IORD and IOWR-instructions to change DM-settings cannot be addressed to
Simple Counters and will generate an error (refer to 5-2-2
"IOWR/IORD-
instruction errors" ). Only the three above mentioned IORD/IOWR-instructions
are supported for Simple Counters.
•
Rate Measurement.
Note 1. The CPU exchanges data with the Simple Counter via the I/O Refresh Data
Area (CIO).
2. If a Counter is configured for Simple Counter, it is indicated in CIO.
3. All the DM-words that are allocated to a Simple Counter to make the Counter
Specific Settings, can be used as work-words.
W902-E2-03.book Seite 48 Donnerstag, 7. Oktober 2004 2:06 14