P0500RY FOXBORO 但3块或2块表同时上电的话,就只有一块表能有正确的数值显示

NI PCI-6254
NI PCI-6602
NI PCI-6221
NI SHC68-68-D1
NI SHC68-68-EPM

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我是用MODBUSBUS RTU的方式通讯方式连接3块电表,每块电表单独上电通讯的话,都可以正确显示数值在画面上,但3块或2块表同时上电的话,就只有一块表能有正确的数值显示。另外2块表也不提示通讯错误,但画面上显示的数值变成了0.都搞不清是哪里的问题了

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