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I have a project using the Temco Thermostats (TSTAT5) which are run on Modbus communication (daisy chain connection, total length about 100 meters)to communicate with the Opto 22 system (a SCADA system). The TSTAT5 is used to provide local HVAC control while at the same time communicate with the Opto 22 system. The Opto 22 system has the authority to access the TSTAT5 to modify setpoint etc. so as to provide central control and monitoring function. Currently, it appears no problem in the communication and can perform the good control and monitoring. But...
Recently, we extend the communication by inserting more TSTAT5 and certain I/O modules in between the Opto 22 and the existing TSTAT5. The total length of new added portion is appro. 80 meters with no T- Tapped connection. We happened to find the Opto 22 can only communicate with the new added TSTAT5 and I/O modules but not the existing one. Can anyone tell me what had happened on this new addition?
Thanks,
SK Wong
Recently, we extend the communication by inserting more TSTAT5 and certain I/O modules in between the Opto 22 and the existing TSTAT5. The total length of new added portion is appro. 80 meters with no T- Tapped connection. We happened to find the Opto 22 can only communicate with the new added TSTAT5 and I/O modules but not the existing one. Can anyone tell me what had happened on this new addition?
Thanks,
SK Wong