LC700 – User’s Guide
2.24
MODBUS and HMI Interface
As mentioned before the CPU-700 communicates using the MODBUS RTU protocol. MODBUS is
an open protocol defined by AEG and widely accepted by manufacturers of industrial devices. This
fact also gives the advantage that probably every important provider of a Man-Machine-Interface
(MMI) or SCADA software has drivers ready for MODBUS. Once the LC700 system is configured
using the CONF700 you will be able to display or print a list with all I/O points (Discrete and Analog)
and Parameters of all Function Blocks used.
With this list the user can complete the information for the communication database of the MMI
software. Once the MMI knows the variables and their addresses it can now read or write to them
allowing the operator to be completel connected to the LC700 logic controller".
HOT SWAP
A few modules have a new hardware feature that allows hot swap module replacement without
causing trouble to the CPU control. With this new feature it is possible to add or remove new
modules with the IMB bus energized.
MODULE ID
This additional circuit allows the CPU to identify new modules of its system through CONF700
without the modules previously being informed in the CONF700 hardware page. During control the
CPU checks the existence of modules. Through the Status block the user keeps an updated run
time check of the modules defined in the hardware page. To do so the user must add the racks in
the hardware page of CONF700 and click on the button CHECK MODULE ID in the lower left part of
the screen. In this way CONF700 informs the user of the modules connected to the respective
selected racks. To check which modules are connected click at USE I/O MODULE ID and so
modules are automatically checked.
NOTE
The M-000 module must be used when there is one available slot in the rack.
Fieldbus Support
As the industry leading provider of Fieldbus solutions Smar offers a few Modules to interface the
LC700 with Fieldbus.
Each channel operates as an independent Fieldbus device in the network. The CPU Module
interacts with it through a set of special Fieldbus blocks to interchange data called Fieldbus Interface
Blocks (FBIB). These Fieldbus blocks can be linked with any other blocks in devices that are in the
network.
The CPU Module sees any Fieldbus Module as a regular I/O Module. The user is the one that
configures (within a limit) the number of input and output signals in the Fieldbus Module that will
interact with the LC700 CPU Module. Those I/O signals can be of mixed types as discrete or analog.
It must be clear that not every link of the Fieldbus Block configuration will be visible from the CPU
Module but only those signals connected to the Fieldbus Interface Blocks (FBIB).
The Fieldbus Block configuration can be achieved by the Smar SYSCON.When preperation of the
LC700 system is necessary it will inform the CONF700 which FBIB’s were used. From this point all
of the signals from the Fieldbus network connected to those FBIB’s are available to the Ladder
Logic in the logic controller control strategy.
To use Smar’s Syscon you will need a PC with a PCI card or a DFI302 linking device. After the
Fieldbus network configuration the PCI won’t be necessary unless the user wants to keep it for
maintenance purposes.
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