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ManualsBrandsEmerson ManualsPower Switching and ControlsEmerson ASCO 5140 Quad-Ethernet Module (Acc. 72EE)
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5140 Quad-Ethernet Module Modbus & ASCOBusII TCP Interfaces 4-1
Modbus / TCP (for Monitoring Systems)
The 5140 QEM can act as a Modbus/TCP server to provide data to a Modbus client on demand. The 5140 QEM
looks transparent to the Modbus/TCP client. The Modbus register in the downstream device looks like it is inside the
5140 QEM. Because the 5140 QEM acts as a data concentrator, the data from downstream devices is constantly
refreshed and available in the 5140 QEM. This design results in a very fast turn-around time.
Accessing Modbus/TCP Data
Accessing parameters by Modbus/TCP requires three components: the IP Address, the device address, and the
Modbus Register number. Modbus/TCP is always enabled in the 5140 QEM.
IP Address
The IP Address required to allow a client the ability to communicate to the 5140 QEM is defined in the configuration
pages of the 5140 QEM web server. Usually the Modbus/TCP Client is on the same network as the Modbus/TCP
server (the 5140 QEM).
Device Address
The 5140 QEM maps the Modbus data using the downstream device address. This is the device address needed when
configuring the Modbus/TCP client. This address can be accessed from the About page of the 5140 QEM webpage
or by going to the enclosure of the device and using the LCD screen and push buttons to locate the address from the
settings page of the device.
Modbus Register
The Modbus register map is the same as that of the downstream device. As an example, the line-to-line voltage
(A-B) of the New Series 300 Transfer Switch’s Group G Controller is at register address 40017. Reading this same
register from the 5140 QEM will provide the data from the Group G Controller to the Modbus/TCP client.
The well known TCP port for Modbus/TCP is 502. This port setting is done on the Configuration/Edit page. The
port is defaulted to 10001. For an example interface using the Modbus Test Suite refer to document 381339-319.
ASCOBusII / TCP Interface
ASCOBusII is a proprietary protocol designed by ASCO Power Technologies for use with ASCO 5700 & 5900 Series
CPMS systems. Accessing ASCOBusII data requires an ASCO Power Technologies technician. ASCOBus II is
always enabled in the 5140 QEM.