![background image](http://html1.mh-extra.com/html/omron/cj1m-cpu21/cj1m-cpu21_operation-manual_742493042.webp)
13
Allocations for Built-in CPU Unit Inputs
Section 2-1
puts IN2, IN3, and IN5 are used for the origin search function when the or-
igin search function for pulse output 1 is enabled in the PLC Setup.
• General-purpose inputs 0 and 1, interrupt inputs 0 and 1, and quick-
response inputs 0 and 1 cannot be used when the origin search function
for pulse output 0 is being used. Also, general-purpose input 4 cannot be
used if operating mode 2 is specified, i.e., the Positioning Completed Sig-
nal is being used.
• General-purpose inputs 2 and 3, interrupt inputs 2 and 3, and quick-
response inputs 2 and 3 cannot be used when the origin search function
for pulse output 1 is being used. Also, general-purpose input 5 cannot be
used if operating mode 2 is specified, i.e., the Positioning Completed Sig-
nal is being used.
Functions
Item
Specifications
1) General-purpose inputs
(10 inputs max.)
The CPU Unit's built-in inputs (bits 00 to
09 of CIO 2960) can be used as general-
purpose inputs.
Note 1:
The inputs can be refreshed
immediately with the immediate refresh-
ing variation (! prefix) of instructions
such as LD.
Note 2:
The same input time constant is
used for all 10 inputs and set in the PLC
Setup. The setting range is 0 to 32 ms
and the default setting is 8 ms.
2) Interrupt inputs
(4 inputs max.)
Direct mode
Interrupt tasks 140 to 143 can be con-
trolled by the CPU Unit's built-in inputs
(bits 00 to 03 of CIO 2960) and the inter-
rupt tasks can be set to start on the ris-
ing or falling edge of the control bits, i.e.,
up or down differentiation.
The response time (between the estab-
lishment of the input condition and exe-
cution of the interrupt task) is
approximately 0.2 ms.
Note
Use the MSKS(690) instruction to
specify Direct or Counter mode
operation as well as up or down
differentiation.
Counter mode
The rising or falling edge of the inputs
(bits 00 to 03 of CIO 2960) can be
counted as an incrementing or decre-
menting counter with a maximum
response frequency of 1 kHz. The corre-
sponding interrupt task (140 to 143) can
be executed when the counter counts
out.
3) Quick-response inputs
(4 inputs max.)
The CPU Unit's built-in inputs (bits 00 to
03 of CIO 2960) can be used as quick-
response inputs. Inputs with an input sig-
nal width as short as 30
µ
s can be
received reliably regardless of the cycle
time and the input signal will be kept on
for 1 cycle.
Summary of Contents for CJ1M-CPU21
Page 1: ...Cat No W395 E1 03 CJ series Built in I O CJ1M CPU21 22 23 CJ1M CPU Units...
Page 2: ...CJ series Built in I O CJ1M CPU21 22 23 CPU Units Operation Manual Revised August 2004...
Page 3: ...iv...
Page 19: ...xx...
Page 79: ...50 Wiring Examples Section 3 3...
Page 217: ...188 Origin Search and Origin Return Functions Section 6 3...
Page 220: ...191 Built in Outputs Section 7 1...
Page 247: ...218 Built in Outputs Section 7 1...
Page 251: ...222 Combinations of Pulse Control Instructions Appendix A...
Page 255: ...226 Using Pulse Instructions in other CPU Units Appendix B...
Page 263: ...234 Index...
Page 265: ...236 Revision History...