marius
Member
- Join Date
- Apr 2005
- Posts
- 239
i have three CPU 315-2DP's, connected via Profibus, all i need to do, is move short datablock (30 bytes) from CPU A and B to CPU C... (CPU C is equipped by Ethernet... so makes a storage for parent system - but this is circumstencial - but to explain) i've been able to locate this thread... and had created configuration as described...
http://www.plctalk.net/qanda/showthread.php?t=9745
(thanks dchartier!)
previously i've worked with profibus gateways... which requires specific speed settings and sync calls... but not with CPU's yet
the question is... if i call SFC15 on CPU A and B every second... how often i should call SFC14 on CPU C ? in order to gain best performace for whole PROFIBUS subnet? is better to read every cycle, or just every second?
SFC15 :: DPWR_DAT
SFC14 :: DPRD_DAT
most probably... there will be also OP, with much higher priority then this transfer function, whole project contain more MPI, PROFIBUS and Ethernet subnets... so i need to avoid some communication problems because some devices are MPI only and etc.
thanks for any timing responses
http://www.plctalk.net/qanda/showthread.php?t=9745
(thanks dchartier!)
previously i've worked with profibus gateways... which requires specific speed settings and sync calls... but not with CPU's yet
the question is... if i call SFC15 on CPU A and B every second... how often i should call SFC14 on CPU C ? in order to gain best performace for whole PROFIBUS subnet? is better to read every cycle, or just every second?
SFC15 :: DPWR_DAT
SFC14 :: DPRD_DAT
most probably... there will be also OP, with much higher priority then this transfer function, whole project contain more MPI, PROFIBUS and Ethernet subnets... so i need to avoid some communication problems because some devices are MPI only and etc.
thanks for any timing responses