Ethernet IO Tab
Original instructions
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Overview
The Ethernet IO tab allows you to configure these parameters in Control Expert:
Task Applications
An M580 CPU can execute single-task and multi-task applications. A single-task application only executes the MAST task. A multi-task application defines the priorities of each task.
There are four tasks available:
Each BMECXM module, is linked to a unique PLC task.
Tasks depend on the profile that is set by Control Expert. For the BMECXM module, there are two profiles:
For more information on tasks, refer to the chapter on Application Program Structure.
Modicon M580 Task Characteristics
The time model and task period are defined as follows:
Task
Time model
Task period (ms)
Range
Default value
MAST(1)
Cyclic(2) or periodic
1...255
20
FAST
Periodic
1...255
5
AUX0
Periodic
10...2550
by 10
100
AUX1
Periodic
10...2550
by 10
200 
(1)
MAST task is mandatory. 
(2)
When set to cyclic mode, the minimum cycle time is 8 ms if there is a RIO network and 1 ms if there is no RIO network in the system.
RPI Values
The Requested Packet Interval (RPI) depends on the profile that is set by Control Expert at instantiation time. For the BMECXM module, there are two profiles:
There are two RPI values:
When the BMECXM module is the scanned by the RIO scanner, the RPI values are as follows:
Task Configuration (Period)
RPI
Process
Calculated Value...
Minimum(2)
Maximum(2)
Periodic (>0)
T->O
1/2 of PLC task period (rounded down ms)
2 ms
255 ms
O->T
1.1 of the PLC task period (rounded up ms)
5 ms
Cyclic(1) (=0)
T->O
1/4 of PLC task watchdog
3 ms
O->T
1/4 of PLC task watchdog
5 ms
 
(1)
For the MAST task only 
(2)
Linked to the task configuration.
When the BMECXM module is the scanned by the DIO scanner a distributed, the RPI values are as follows:
Mast Task Configuration (Period)
RPI
Process
Default Value...
Minimum(1)
Maximum(1)
Periodic (>0)
T->O
2 times of PLC task period
1/2 of PLC task period (rounded down ms)
1500 ms
O->T
2 times of PLC task period
1.1 of the PLC task period (rounded up ms)
Cyclic (=0)
T->O
1/4 of PLC task watchdog
2 ms
255 ms
O->T
1/4 of PLC task watchdog
5 ms 
(1)
Linked to the mast task configuration.
NOTE: Outputs that have changed are published at the end of each PLC scan. For the other ones, the default value applies.
Hold Up Time
The hold up time represents the timeout of input reception to switch to FALLBACK state. By default the Hold Up Time = 4 x Watchdog.
You can modify the Hold Up Time value if you set a value greater than the default value and lower than 5 seconds.
NOTE: For the application, the maximum value is 5 s even if the default or set value is greater than 5 s.
Fallback
The fallback information defines the behaviors of the device:
Starting Mode
WARNING
UNEXPECTED EQUIPMENT BEHAVIOR
Do not use RIO_CTRL and DIO_CTRL control bits of the M580 CPU device DDT to start or stop the scan of the BMECXM.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
You can select: