Using XXMIT, XMIT, or L9_XMIT on Momentum, a loss of communications between a PLC Modbus Master and Slave is not detected
Issue
This Resolution is to inform users of Unity Momentum processors about an issue when using the XXMIT communication function block. The XXMIT, XMIT, and L9_XMIT will not exhibit an error 116 (communications timeout) in the 'Status' output word of the function block if the communications cable is removed between the master and slave device.
The XXMIT, XMIT, and L9_XMIT will not exhibit an error 116 (communications timeout) in the 'Status' output word of the function block if the communications cable is removed between the master and slave device.
The normal operating behavior of a broken media between a master and slave device is that an error 116 will be displayed in the STATUS output of the XXMIT function block. In specific versions of Unity, an error 116 will not be observed.
The following table lists these conditions.
Product Line
171CBU78090
171CBU98090
171CBU98091
Resolution
Solution will be in Unity versions 11.1 and higher.
If Unity 11 is used, there are two additional HotFixes that must be installed to fix this issue.
This Resolution is to inform users of Unity Momentum processors about an issue when using the XXMIT communication function block. The XXMIT, XMIT, and L9_XMIT will not exhibit an error 116 (communications timeout) in the 'Status' output word of the function block if the communications cable is removed between the master and slave device.
The XXMIT, XMIT, and L9_XMIT will not exhibit an error 116 (communications timeout) in the 'Status' output word of the function block if the communications cable is removed between the master and slave device.
The normal operating behavior of a broken media between a master and slave device is that an error 116 will be displayed in the STATUS output of the XXMIT function block. In specific versions of Unity, an error 116 will not be observed.
The following table lists these conditions.
| XXMIT with Unity Version | Status | Solution |
| 8 | Fails – No error 116 displayed | Upgrade to Unity 11 Install - HF1 Install - UnityPro_V110_HF0258202R |
| 8.1 | Fails – No error 116 displayed | Upgrade to Unity 11 Install - HF1 Install - UnityPro_V110_HF0258202R |
| 10 | Functional– Error 116 is displayed | No action required |
| 11 | Fails – No error 116 displayed | Install - HF1 Install - UnityPro_V110_HF0258202R |
Product Line
171CBU78090
171CBU98090
171CBU98091
Resolution
Solution will be in Unity versions 11.1 and higher.
If Unity 11 is used, there are two additional HotFixes that must be installed to fix this issue.
- UnityPro_V110_HF0258202R (see attachment)
- UnityPro_V110_HF1 (can be found on www.schneider-electric.com or by launching SESU)
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