Siemens SINUMERIK 840D sl Function Manual page 76

Several Operator Panels on Several NCUs, Distributed Systems (B3)
2.1 Brief Description
NCU link with different IPO cycles
It is possible to use an NCU link between NCUs with different interpolation cycles for special
applications, such as eccentric turning.
Host computer
Communication between host computers and control units is described in:
References:
/FBR/ Function Description RPC SINUMERIK Computer Link
PLC-PLC communication
DP Master, DP Slave, DP-DP coupler, cross-communication via PBK
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Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions