Schneider Electric 890USE17700 - Manual (Page 170)

Advanced Configuration Features
170 890USE17700 April 2004
The HMI Blocks in the Island Data Image
Summary An HMI panel that communicates using the Modbus protocol can be connected to
the CFG port (See The CFG Interface, p. 33) on the NIM. Using the Advantys
configuration software, you can reserve one or two blocks of registers in the data
image (See A Modbus View of the Island’s Data Image, p. 165) to support HMI data
exchange. When an HMI panel writes to one of these blocks, that data is accessible
to the fieldbus master (as inputs). Data written by the fieldbus master (as outputs) is
stored in a different reserved block of registers that the HMI panel can read.
HMI Panel
Configuration Advantys STB supports the ability of an HMI panel to act as:
z an input device, which writes data to the island’s data image that is read by the
fieldbus master
z an output device, which can read data written by the fieldbus master to the
island’s data image
z a combined I/O device
HMI Input Data
Exchange Input data to the fieldbus master can be generated by the HMI panel. Input controls
on an HMI panel might be elements such as:
z push buttons
z switches
z a data entry keypad
To use an HMI panel as an input device on the island, you need to enable the HMI-
to-fieldbus master block in the island’s data image (See The Data Image, p. 166)
and specify the number of registers in this block that you want to use for HMI-to-
fieldbus master data transfers. You must use the Advantys configuration software to
make these configuration adjustments.
The HMI-to-fieldbus master block can comprise up to 512 registers, ranging from
register 49488 to 49999. (Your actual register limit will be dictated by your fieldbus.)
This block follows immediately after the standard input data and I/O status process
image (See Input Data and I/O Status Process Image, p. 169) block (registers 45392
through 49487) in the island’s data image.
The HMI panel writes the input data to a specified number of registers in the HMI-
to-fieldbus master block. The NIM manages the transfer of the HMI data in these
registers as part of the overall input data transfer—it converts the 16-bit register data
to a fieldbus-specific data format and transfers it together with the standard input
data and I/O status process image to the fieldbus. The fieldbus master sees and
responds to HMI data as if it were standard input data.