Slot 4 Menu 9 − Resources

Mode: Open‑Loop

Message Load

The Ethernet interface can accomodate multiple protocols running concurrently, each protocol demanding system resources. To ensure that the interface is not overloaded the following limitations should be followed.

  1. maximum number of parameter accesses per second is 6000 (Unidrive M Ethernet interface) / 200 (SI-Ethernet on Unidrive M200 - M600)
  2. maximum number of messages per second (02.004) is 8000

When checking that the message loading on a device is going to be acceptable, consider all protocols, e.g.: 

Protocol

Number of Parameters

Rate

Parameters Accesses  / Second

Message Rate / Second

Modbus TCP/IP

10 read

100 ms

100

10

EtherNet/IP

5 read

10 ms

500

100

5 write

10 ms

500

100

RTMoE

2 write

500 µs

4000

2000

Total

5100

2210

Max. supported on M700/M800

6000

8000

Within Capability?

Yes

Yes

Cyclic data, with the exception of synchronous cyclic data, is exchanged with the drive and other options in the interface's background task. Background cycles per second (4.09.008) can be used to view the cycle rate of the background task. If the value drops to zero then a BG Overrun drive trip will occur.

RTMoE

RTMoE is an industrial Ethernet protocol for both cyclic and acyclic communication. The Ethernet interface RTMoE capabilities can be found in the table below.

Capability

Support Level

Non-cyclic communication

Supported

Total transmit cyclic links

5

Total receive cyclic links

5

Max number of transmit synchronous cyclic links

1 (Unidrive M interface only)

Max number of receive synchronous cyclic links

1 (Unidrive M interface only)

Max length of  non-synchronous cyclic link

10 x 32 bit

Max length of synchronous cyclic link

2 x 32 bit

Min transmission period

500 µs

Synchronized with AMC

Yes (when cycle time >= 500us)

Synchronized with onboard program

Yes (when cycle time = 4ms)


Parameter4.09.001  Cyclic Tx Links Free
Short description 
Minimum0Maximum255
Default Units 
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

The number of available transmit cyclic links.


Parameter4.09.002  Cyclic Rx Links Free
Short description 
Minimum0Maximum255
Default Units 
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

The number of available receive cyclic links.


Parameter4.09.003  Fieldbus Links Free
Short description 
Minimum0Maximum255
Default Units 
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

The number of available transmit / receive process images for fieldbus protocols such as Ethernet/IP.


Parameter4.09.004  Cyclic Mappings Free
Short description 
Minimum0Maximum255
Default Units 
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

The number of available mappings in the system for use in cyclic links.


Parameter4.09.008  Background cycles per second
Short description 
Minimum0Maximum65535
Default Units 
Type16 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

The background task cycles per second represents the number of times per second the background task is currently executing. The background task is responsible for cyclic data exchange with the drive. With more cyclic data mapped the cycle rate of the task will decrease. 


Parameter4.09.010  Synchronous Task % Free
Short description 
Minimum0Maximum255
Default Units%
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

Note: Synchronous Cyclic Links are supported on (Unidrive M Ethernet interface) but not on (SI-Ethernet on Unidrive M200 - M600).


Parameter4.09.020  Synchronous Task Worst % Free
Short description 
Minimum0Maximum255
Default Units%
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT, BU

Worst case free resource of the synchronous task.

Note: Synchronous Cyclic Links are supported on (Unidrive M Ethernet interface) but not on (SI-Ethernet on Unidrive M200 - M600).


Parameter4.09.030  PCB Temperature
Short description 
Minimum-128Maximum127
Default Units°C
Type8 Bit VolatileUpdate RateBackground write
Display FormatStandardDecimal Places0
CodingRO, ND, NC, PT