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Dear Experts,
I have a problem in command execution from dcs on Modbus.
We have a data concentrator, which is polling serial devices and transferring data to Hmi and DCS.
problem is ...while we give command from the dcs, it is getting delayed by 2-3 min. but from hmi it is getting executed with in 10 sec.
While investigating further we found that hmi is scanning status of start and stop coil on func code 1, although i have not configured func code 1 in hmi. when i give command from the hmi it write start coil on func code 5 and again started scanning of coil in fuc code1. in this case motor starts in 10 sec.
Now, in dcs in normal condition (no command issued from dcs), dcs is writing 0 in start and stop coil of each motor with func code 5 during every scanning cycle. when i give command it writes 1 with func code 5. and again started writing 0 in each motor with func code 5. in this case command execute in motor after 2-3 min.
Please help!
Thanks,
VK
I have a problem in command execution from dcs on Modbus.
We have a data concentrator, which is polling serial devices and transferring data to Hmi and DCS.
problem is ...while we give command from the dcs, it is getting delayed by 2-3 min. but from hmi it is getting executed with in 10 sec.
While investigating further we found that hmi is scanning status of start and stop coil on func code 1, although i have not configured func code 1 in hmi. when i give command from the hmi it write start coil on func code 5 and again started scanning of coil in fuc code1. in this case motor starts in 10 sec.
Now, in dcs in normal condition (no command issued from dcs), dcs is writing 0 in start and stop coil of each motor with func code 5 during every scanning cycle. when i give command it writes 1 with func code 5. and again started writing 0 in each motor with func code 5. in this case command execute in motor after 2-3 min.
Please help!
Thanks,
VK