3 cyclic communication – KEYENCE CB-EP100 User Manual
Page 50
- EtherNet/IP Network Unit CB-EP100 User’s Manual (LJ-V7000 Edition) -
3-3 Cyclic communication
3-26
3
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Example of the handshake process for auto-zero/timing requests
*
When setting auto-zero of OUT1 to ON
(1) When the value of the OUT area with an auto-zero request assigned changes from
0 to 1, the measuring instrument starts the auto-zero update process by cyclic
communication so that the status becomes the auto-zero ON/OFF specification at
that time.
(2) When the measuring instrument completes the requested process (or the process
fails), the status bit that indicates auto-zero completion (or failure) becomes 1.
The bit indicating the auto-zero status becomes 1 simultaneously with auto-zero
completion.
(3) When the value of the OUT area with an auto-zero request assigned changes from
1 to 0, the status bit that indicates auto-zero completion (or failure) becomes 0.
(4) The time when the measuring instrument is performing the requested process.
Example of the handshake process for program switch requests
*
When program number changed from 0 to 5
(1) When the value of the OUT area with a program switch request assigned changes
from 0 to 1, the measuring instrument starts the program switch process by cyclic
communication so that the number becomes the one specified in the program
number specification at that time.
(2) When the measuring instrument completes the requested process (or the process
fails), the new program number after the change is input by cyclic communication
as the current program number of the IN area. The status bit that indicates
program switch completion (or failure) becomes 1.
(3) When the value of the OUT area with a program switch request assigned changes
from 1 to 0, the status bit that indicates program switch completion (or failure)
becomes 0.
(4) The time when the measuring instrument is performing the requested process.
PLC
1
Auto-zero ON/OFF specification
Bit 0 of OUT area [30]
0
1
Auto-zero request
Bit 0 of OUT area [14]
0
1
Auto-zero completion (or failure)
Bit 0 of IN area [48]
0
Auto-zero status
Bit 0 of IN area [36]
1
0
Measuring instrument
Error clear process
Processing
(4)
(1)
(2)
(3)
PLC
Program number specification
32-bit data of OUT area [56 to 59]
0000H
0005H
Program switch request
Bit 0 of OUT area [44]
Program switch completion (or failure)
Bit 0 of IN area [76]
Current program number
32-bit data of IN area [96 to 99]
0000H
0005H
Measuring instrument
Program switch process
Program 0
Processing
Program 5
(1)
(2)
(3)
(4)