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You cannot alter the connection bit.
The web page IOscanner, is a strange item. Connection bits have little meaning for Modbus TCPIP devices as the ordering of the bits is dependent on the device number. The device number can be modified by the user and is displayed lowest number first. The number of bits allocated to a device is based on the number of transactions in order from the first to the last. For Ethernet/IP devices the connection bit number determines the order.
If you are not sure what the web page IOscanner animation box refers to, place the cursor over the box and right mouse click. The transaction health, device number, protocol, IP address and connection ID (BIT) displayed.
Please note in the most recent versions of Control Expert such as V16.0, when you add a device to a NOC module or a CPU it takes on a device number that you can alter as required. e.g. For a NOC301.4 you can set the device number from 000 to 127. For the CPU this will range from 513 to 640. (note depending on the CPU this may be limited from 513 to 576). See the first image which shows you how to modify the device number.
The device number is index used in the DIO_HEALTH and DIO_CTR. E.g. if you configure a Modbus device called "MD_001" and this is assigned device number 513 in the CPU, you can control MD_001 by "BMEP58_ECPU_EXT.DIO_CTR[513]". You can monitor the health of MD_001 by either "BMEP58_ECPU_EXT.DIO_HEALTH[513]" or "MD_001.Freshness". If you create 2 transactions for MD_001 in addition to Freshness you will see "MD_001.Freshness_1" and ""MD_001.Freshness_2" each freshness relates to the individual transaction of the same number.
Note that when you disable a device by setting the MEP58_ECPU_EXT.DIO_CTR[513]=1 all the transactions for that device are also disabled.
I hope this helps answer your question.
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