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QUESTION:
How do I run TeleService with the ET200S
(IM151-CPU)?
ANSWER:
You want to set up a remote link to an ET200S
(IM151-CPU).
The following components are available for
running TeleService with the ET200S (IM151-CPU):
- SIMATIC
TeleService as Options Package for STEP 7
- TS
Adapter
TeleService enables the follow operating
modes:
- Teleservice
- PLC - PG/PC remote link
- PLC – PLC remote link
1. Teleservice
In this operating mode a connection is set up from the PG/PC to
the ET200S CPU. The ET200S is server. This also permits
unrestricted operation with a passive interface on the ET200S.
Here the local PG/PC sets up a remote connection via modem to
the remote TS Adapter itself, then an S7 connection to the remote
CPU. Via the connections that have been set up you can run the STEP
7 services such as Download/Upload, Status/Control, Online
Diagnostics etc. on the remote CPU.
Figure 1: Teleservice
2. PLC - PG/PC remote link
This type of link is not possible in an ET200S CPU with
passive DP interface for the following reasons:
In this operating mode an S7 connection is set up via the
function block "PG_DIAL" from the PLC to the local TS Adapter. The
function block "PG_DIAL" is supplied with the TeleService software
and integrated into the installed STEP 7 package. The "PG_DIAL" FB
internally calls the blocks of the S7 basic communication: X_SEND
and X_GET. The TS Adapter itself then sets up a remote connection
to the remote PG/PC via the connected modem. In this connection, an
application (created with PRODAVE MPI) plays the relevant partner.
In this case then the CPU must take the initiative to set up a
connection. This is only possible if the interface of the CPU is
active and has MPI properties (S7 basic communication
supported with X blocks).
Figure 2: PLC-PG remote link
3. PLC – PLC remote link
This link is for the CPU-CPU communications via WAN. At least
one partner must take the initiative to set up the connection
(initiator) and for this the communications interface of this
partner must be active and the blocks of the S7 basic communication
available (X_PUT, X_SEND, X_GET, X_ABORT). For the other partner it
is sufficient to have the server functionality, this is then also
possible with a passive interface.
An S7 connection to the local TS Adapter is set up via the
function block "PLC_DIAL" in the local CPU. The function block
"PLC_DIAL" is supplied with the TeleService software and integrated
into the installed STEP 7 package. The "PLC_DIAL" FB supplies the
selection information to the local TS Adapter and then the TS
Adapter sets up a remote connection to the remote TS Adapter via
the connected modem. During data transfer, the remote TS Adapter
behaves like a "transparent router". It sets up an S7 connection to
the remote CPU and with the operating firmware of the remote CPU it
executes the X_GET and X_PUT tasks without there being a need for a
user program for this functionality on the remote CPU.
The ET200S CPU has a passive interface and thus supports
a PLC-PLC remote link as server, though only for the system
functions X_PUT and/or X_GET in the initiator (local CPU). The
PROFIBUS interface of the ET200S can then be compared with an MPI
interface (PB address = MPI address). The ET200S must be connected
to the same PROFIBUS segment as the TS Adapter. When parameterizing
the TS Adapter, you must set the PROFIBUS profile that corresponds
to the ET200 CPU.
Figure 3: PLC-PLC remote link
Keywords:
Teleservice
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german
