TM3 I/O Configuration General Description

Introduction

The I/O expansion bus of the bus coupler is formed when you assemble the TM3 I/O expansion modules to the bus coupler.

The following modules are supported:

  • TM3 Digital (TM3D•)

  • TM3 Analog (TM3A•/T•)

  • TM3 Safety (TM3S•)

  • TM3 TeSys (TM3XTYS4)

  • TM3 Transmitter and Receiver (TM3XTRA1, TM3XREC1)

Specific notes:

  • Fallback and filter are only supported by firmware version greater than 2.0 for the TM3 Digital (TM3D•)

    modules, except TM3DM16R and TM3DM32R.

  • You can connect a maximum of 10 TM3 Safety modules to one TM3 bus coupler.

Fallback Behavior

When encountering fieldbus timeout or releasing of bus ownership in Web server session, the TM3 bus coupler:

  • applies the fallback values to the outputs of the expansion modules if they have been configured or

  • sets the output values of the expansion modules to 0 if no fallback values have been configured. If 0 is outside the range according to the configuration of a particular output channel, the last values will be maintained.

The TM3 bus coupler sets the output values of the expansion modules:

  • to 0 when a new configuration is received from the controller, or

  • after recovering from timeout and writing of the fallback values, the following TM3 bus coupler IO region is read first before being written:

    • TM3BCEIP (Modbus TCP): Registers 1...199, 3001...3999

    • TM3BCSL: Registers 1...199, 3001...3999

The configuration request is sent by the controller after the following event is done: Initialize controller.

I/O Expansion Bus Error Handling

When the bus coupler detects an expansion module in bus communication error it sets the bus to a "bus off" condition whereby the expansion module outputs, the input image value and the output image value are set to 0. An expansion module is considered to be in bus communication error when an I/O exchange with the expansion module has been unsuccessful for at least 10 consecutive bus task cycles.

Normal I/O expansion bus operation can only be restored after eliminating the source of the error and performing one of the following:

Match Software and Hardware Configuration

The I/O that may be embedded in your controller is independent of the I/O that you may have added in the form of I/O expansion. It is important that the logical I/O configuration within your program matches the physical I/O configuration of your installation. If you add or remove any physical I/O to or from the I/O expansion bus or, depending on the controller reference, to or from the controller (in the form of cartridges), then you must update your application configuration. This is also true for any field bus devices you may have in your installation. Otherwise, there is the potential that the expansion bus or field bus no longer function while the embedded I/O that may be present in your controller continues to operate.

 WARNING
UNINTENDED EQUIPMENT OPERATION
Update the configuration of your program each time you add or delete any type of I/O expansions on your I/O bus, or you add or delete any devices on your field bus.
Failure to follow these instructions can result in death, serious injury, or equipment damage.

The Optional Feature for I/O Expansion Modules

The Optional module feature provides a more flexible configuration by the acceptance of the definition of modules that are not physically attached to the logic controller. Therefore, a single application can support multiple physical configurations of I/O expansion modules, allowing a greater degree of scalability without the necessity of maintaining multiple application files for the same application.

You must be fully aware of the implications and impacts of marking I/O modules as optional in your application, both when those modules are physically absent and present when running your machine or process. Be sure to include this feature in your risk analysis.

 WARNING
UNINTENDED EQUIPMENT OPERATION
Include in your risk analysis each of the variations of I/O configurations that can be realized marking I/O expansion modules as optional, and in particular the establishment of TM3 Safety modules (TM3S…) as optional I/O modules, and make a determination whether it is acceptable as it relates to your application.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
NOTE: For more details about this feature, refer to Optional I/O Expansion Modules.