Remote I/O Communications Characteristics; I/O Response Time - Omron DEVICENET#05-2003 Operation Manual

Remote I/O Communications Characteristics

6-1

Remote I/O Communications Characteristics

6-1-1

I/O Response Time

PC
DeviceNet Master Unit
DRT1-COM Communications Unit
Input Unit
Output Unit
190
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).
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 : Input I/O Unit ON (OFF) delay time
IN
T : Output I/O Unit ON (OFF) delay time
OUT
T : I/O Unit interface communications time (1.5 ms)
RT-IF
T : Communications time for 1 Slave (refer to page 192)
RT
The minimum I/O response time (T
T = T
MIN
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 I/O response time
+ T + (DeviceNet I/O response time) + T
IN RT-IF
) is the total of the following terms:
MIN
Section 6-1
+ T
RT-IF OUT