190
Remote I/O Communications Characteristics
Section 6-1
6-1
Remote I/O Communications Characteristics
This section describes the characteristics of DeviceNet communications when
OMRON Master and Slave Units are being used. Use this section for refer-
ence when planning operations that require precise I/O timing.
The equations provided here are valid under the following conditions:
1,2,3...
1.
The Master Unit is operating with the scan list enabled.
2.
All of the required Slaves are participating in communications.
3.
No errors are being indicated at the Master Unit
4.
Messages are not being produced in the Network (from another company’s
configurator, for example).
Note
1.
The values provided by these equations may not be accurate if another
company’s Master or Slave is being used in the Network.
2.
This manual only refers to parts related to the MULTIPLE I/O TERMINAL.
For details about the Master Unit or the entire DeviceNet, refer to the De-
viceNet Operation Manual (W267), and for details about Slaves other than
the MULTIPLE I/O TERMINAL, refer to the DeviceNet Slaves Operation
Manual (W347).
6-1-1
I/O Response Time
The I/O response time is the time it takes from the reception of an input signal
at an Input Slave (MULTIPLE I/O TERMINAL Input I/O Unit) to the output of
the corresponding output signal at an Output Slave (MULTIPLE I/O TERMI-
NAL Output I/O Unit).
Minimum I/O Response Time
The minimum I/O response times are the I/O response times shown in the fol-
lowing diagram.
T
IN
:
Input I/O Unit ON (OFF) delay time
T
OUT
:
Output I/O Unit ON (OFF) delay time
T
RT-IF
: I/O Unit interface communications time (1.5 ms)
T
RT
:
Communications time for 1 Slave (refer to page 192)
The minimum I/O response time (T
MIN
) is the total of the following terms:
T
MIN
= T
IN
+ T
RT-IF
+ (DeviceNet I/O response time) + T
RT-IF
+ T
OUT
Note For details on the Input I/O Unit input delay time and the Output I/O Unit out-
put delay time, see information on the I/O Units in 1-1 MULTIPLE I/O TERMI-
NAL; for details on the DeviceNet I/O response times, see the explanation of
the remote I/O communications performance.
Note Refer to the PC’s Operation Manual for details on the PC’s cycle time.
Peripheral servicing cycle time
DeviceNet Master Unit
DRT1-COM Communications Unit
DeviceNet I/O response time
Input Unit
Output Unit
PC
Summary of Contents for DRT1-COM
Page 1: ...OPERATION MANUAL Cat No W348 E1 05 DRT1 COM GT1 Series DeviceNet MULTIPLE I O TERMINAL ...
Page 2: ...DRT1 COM GT1 Series DeviceNet MULTIPLE I O TERMINAL Operation Manual Revised May 2003 ...
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Page 233: ...DRT1 COM GT1 Series DeviceNet MULTIPLE I O TERMINAL Cat No W348 E1 05 OPERATION MANUAL ...