IME NEMO 96 HD+ - Nemo Manager Description

PROTOCOL COMMUNICATION
PT10789220
pag. 20/22
8. Nemo Manager Description
The NEMO Manager is the SIMATIC S7 Project for Data Management of the Measuring Instrument NEMO Profibus and
NEMO Profibus-DP Link-Module.
Description of Software Function
The core of the NEMO-MANAGER is the function block FB80, that organises the transfer of measured data to the PLC of
every NEMO instrument, which is connected to Profibus DP. Both versions of interface technology can be served, the
NEMO with internal interface and the external Link Module .
In the S7 software a call of the function block has to be installed with an own instance data block and an own destination
data block for measured values for every connected NEMO
Because the amount of data from one NEMO is larger than 32 bytes, several transfer cycles are necessary. In every
multiplex cycle the Profibus master reads a data block from the Profibus consisting of a 4 byte header and 28 data byte.
The sequences in function block FB80 for reading values are started by a release bit. When the FB 80 serves a single
Profibus NEMO, the release bit must always be set TRUE before calling the FB. This bit can always be the same, because
the base addresses are different.
Example for single Profibus NEMOs:
SET
= M2.0 // Release bit is set to 1
CALL FB80, DB80 // Call the manager with instance data block DB90
BASEADR_DP :=96 // Projected start address of peripheral input/output area in the hardware
configuration
DEVICE_ADR := // Not used for single Profibus NEMOs
DEST_DB :=DB61 // Destination data block for values
...
RELEASE :=
M2.0
// Release bit for this call
NEXT_INST:= // Not used for single Profibus NEMOs
* * *
SET
= M2.0 // Release bit is set to 1
CALL FB80, DB81 // Call the manager with instance data block DB91
BASEADR_DP :=128 // Projected start address of peripheral input/output area in the hardware
configuration
DEVICE_ADR := // Not used for single Profibus NEMOs
DEST_DB :=DB62 // Destination data block for values
...
RELEASE :=
M2.0
// Release bit for this call
NEXT_INST:= // Not used for single Profibus NEMOs
When an external Link Module is connected with several instruments, only 1 release bit with status TRUE is allowed. This
is valid for calls with the same base address DP. In this case all release bits must be different.
At power on a service routine has to guarantee that only one of the release bits is controlled to 1 and the other to 0 status.