Siemens SIPLUS RIC IEC on S7 Manual page 9

Pre-condition for using the nodal blocks is the existence of minimum two IEC-channels in the system.
They mostly consist of an IEC-Slave (as interface to the control center) and an IEC-Master (interface to
the subordinated RTU).
Figure Nodal blocks:
The figure shows the „classical" information flow from an subordinated station via the node to the control
center (monitoring direction, _MD) resp. from the control center via the node to the subordinated station
(command direction _CD).
Each of the node application blocks (,MaoSLi_MD and ,SloMAi_CD') have one interface each to the
source and to the target application available, which have to be interconnected according to the following
description
MAoSLi_MD, for the monitoring direction
The flow direction of the information is:
Master (source) -> node -> Slave (target)
The application block , MAoSLi_MD' is connected via the pointer ‚P_Application (Master)' with the
‚S7_IEC_Config' of the Master protocol version (information source) like the MAo-blocks. i.e. the func-
tional block will be linked directly to the IEC-Master-activation.
The link to the Slave-application (information target) is carried out like the activation of the SLi-blocks with
the pointer ‚P_SLi (Slave)' via an organization block ‚SL_Org_Asdu_1'. The parameterized ASDU-
address from the ‚SL_Org_Asdu_1' will be also used for the information of the nodal block.
SLoMAi_CD, for the command direction
The flow direction of the information is:
Slave (source) -> node -> Master (target)
The application block ,SLoMAi_CD' is connected via the pointer ‚P_Application (Slave)' with the
‚S7_IEC_Config' of the Slave protocol version (information source) like the SLo-blocks.
The link to the Master-application (information target) is carried out with the pointer ‚P_Application (Mas-
ter)' to the ‚S7_IEC_Config' of the Master protocol version like the MAi-blocks.
Notice!
All application blocks are designed exclusively for the OB1 priority level. The FB100
communication blocks ('S7_IEC_Config') also have to be operated in priority level OB1!
SIPLUS RIC IEC on S7 V1.5
Functional description
Page 9 of 28
I IA CE
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