Reference
Making special settings in the "Properties > General > Settings" parameter group
Depending on the CP type, you will see the option "Multiplex OP connections"
Multiplex mode
To connect TD/OPs and/or HMI devices, you can optimize the connection resources in the S7-300 CPU by allowing up to 16 such devices to communicate on a single CPU connection resource (multiplex mode).
If you do not use multiplex mode, the number of TD/OPs and/or HMI devices that can be used will depend on the number of available connection resources of the CPU used.
Use of internal CPU connection resources
Configured S7 connections via the CP use the same multiplex channel that you use in multiplex mode for HMI connections. This means that when you configure S7 connections, you already occupy one CPU connection resource.
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Note PG connections are not operated via the multiplexer; one connection resource is always occupied when you operate a PG. |
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Note Addressing in multiplex mode In multiplex mode, the rack/slot assignment of the CP must be specified instead of the rack/slot assignment of the CPU when assigning addresses for TD/OP/HMI connections. Applications (for example ProAgent) that require block-related alarms (Alarm_S: SFC 17, SFC 18, SFC 19) are not supported in multiplex mode. |