Hello,
My goal is to have a micrologix 1400 plc read data from a hart modem HRT-710. so I can read flow and totalizer and display them on HMI.
We have 3 other sites that are identical to this new site. I used all same programming for the PLC, flow meter (flowmag50W) and Hart modem (HRT-710).
the only difference is the new site has only one flow meter instead of 2 flowmeters, for that reason, I made sure to select point to point inside the hart modem (HRT -710).
I proved that the HART 710 modem is not defective by swapping with a unit from a different site.
I can read flow data and totalizer data from the flow meter via hart using the HRT-710 modem software, and using PC based software(Modbus master tool) but this was accomplished by using the RS 323 on the HRT 710. note that the HRT 710 has RS 232 and RS 485 to communicate, but only one can be used at the time.
When the PLC tries to retrieve data from the HRT 710 using a message instruction, it doesn't work. Message keeps saying error 37 " time out in local processor. this PLC programming is the same as other sites.
On the Modbus side, I also have one VFD that is communicating perfectly to the PLC, But not the hart modem?... I'm using 400 ohms resister for termination on both sides, I tried 250 ohms but didn't make a difference.
Also, the baud rate is same on all slaves and master.
And HART modem hart 710 is using net ID 3, PLC message instruction to pool the modem is using that same net ID 3.
and cable runs are very short.
I'm very confused, If any one has a suggestion. please let me know...!!
Thank you very much
My goal is to have a micrologix 1400 plc read data from a hart modem HRT-710. so I can read flow and totalizer and display them on HMI.
We have 3 other sites that are identical to this new site. I used all same programming for the PLC, flow meter (flowmag50W) and Hart modem (HRT-710).
the only difference is the new site has only one flow meter instead of 2 flowmeters, for that reason, I made sure to select point to point inside the hart modem (HRT -710).
I proved that the HART 710 modem is not defective by swapping with a unit from a different site.
I can read flow data and totalizer data from the flow meter via hart using the HRT-710 modem software, and using PC based software(Modbus master tool) but this was accomplished by using the RS 323 on the HRT 710. note that the HRT 710 has RS 232 and RS 485 to communicate, but only one can be used at the time.
When the PLC tries to retrieve data from the HRT 710 using a message instruction, it doesn't work. Message keeps saying error 37 " time out in local processor. this PLC programming is the same as other sites.
On the Modbus side, I also have one VFD that is communicating perfectly to the PLC, But not the hart modem?... I'm using 400 ohms resister for termination on both sides, I tried 250 ohms but didn't make a difference.
Also, the baud rate is same on all slaves and master.
And HART modem hart 710 is using net ID 3, PLC message instruction to pool the modem is using that same net ID 3.
and cable runs are very short.
I'm very confused, If any one has a suggestion. please let me know...!!
Thank you very much