Remote Communication Characteristics; I/O Communication Characteristics - Omron GRT1 - 27-11-2006 Operation Manual

Remote Communication Characteristics

3-5

Remote Communication Characteristics

3-5-1

I/O Communication Characteristics

I/O Response Time
Minimum I/O Response
Time
PLC
PROFIBUS
Communications Unit
SmartSlice bus
Input Unit
Output Unit
Note
This section describes the characteristics of PROFIBUS I/O communication
between a GRT1-PRT and an OMRON Master. Use this section for reference
when planning operations that require precise I/O timing.
The equations provided here are valid under the following conditions:
• All of the required Slaves are participating in communication.
• No errors are being indicated at the Master Unit.
• No third-party Master or Configurator is being used in the network.
Note This manual describes the communication with the SmartSlice I/O System
only. For details on the Master Unit or overall PROFIBUS network, refer to the
CS/CJ-series PROFIBUS DP Master Units Operation Manual (W409).
The I/O response time is the time it takes from the reception of an input signal
at an Input Unit in the SmartSlice I/O System to the output on an Output Unit
in the SmartSlice I/O System after being processed by the PLC program.
The minimum I/O response time (T
T = T + T
MIN IN SL-IN
+ T
SL-OUT
T
SL-CI -
T
SL-IN -
T
IN
T : The Input Unit's ON (OFF) delay
IN
T : The Output Unit's ON (OFF) delay
OUT
T : The SmartSlice bus' communication time (input data)
SL-IN
T : The SmartSlice bus' communication time (output data)
SL-OUT
T : The SmartSlice Communication Unit's input data processing time
SL-CI
T : The SmartSlice Communication Unit's output data processing time
SL-CO
T : The Input Slave's communication time/Slave
RT-IN
T : The Output Slave's communication time/Slave
RT-OUT
T : The PROFIBUS communication time/Slave
RT
T : The PLC's cycle time
PLC
T : The PLC's PROFIBUS Unit refresh time
RF
Refer to the GRT1 Series SmartSlice I/O Units Operation Manual for details
on Input Unit's input delay times and Output Unit's output delay times.
) is the total of the following terms:
MIN
+ T + T + (T
SL-CI RT-IN PLC
+ T
OUT
T
PLC
T
RF
T T
RT-IN - RT-OUT
Section 3-5
- T ) + T + T
RF RT-OUT SL-CI
-
T
SL- CO -
T
SL- OUT -
T
OUT
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