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4
Connecting
Communication
Devices
4.1. E2 MODBUS Direct
Support for RLDS
4.1.1. Network Connection to E2
Connecting an RLDS to an E2 unit requires the E2
version 3.01 and above. Contact Emerson for upgrade
information if the controller is a version prior to 3.01.
4.1.1.1. COM Port Associations - E2
Versions 3.xx and Below
E2 PIB COM PORT ASSOCIATIONS
E2 Enclosure (Right Side)
E2 Modem/Expansion
COM Card Mounted
Above PIB
RS232
COM3
Plug-In
Modem
Card
RS485 COM Card
(2 Connectors)
POWER INTERFACE BOARD
COM4
Serial Device
RS485 COM Port
(2 Connectors)
COM2
Figure 4-1 - Location of E2 COM Ports - E2 PIB Board (E2
version 3.xx and below)
An E2 has up to three COM ports that can be
assigned for MODBUS communication (COM2, an
RS485 port on the E2 power interface board, and
16 • RLDS I&O Manual
COM6
COM1
RS485
Serial Device
RS232 Port
(PIB)
COM4 and COM6, which are optional ports requiring
expansion cards). COM ports can only be used for one
function; in other words, if COM2 is set up as the I/O
network, you cannot connect MODBUS devices to
COM2. Ensure your E2 is equipped with an RS485
COM Card (P/N 637-4890) and configured in E2
General Services (
enable COM4 or an E2 Expansion COM Card
(P/N 637- 4871) to enable COM6.
Connect the MODBUS network cable to the
three-terminal connector on the COM port you wish
to assign as MODBUS. Wire RS485+ to the RLDS+
RS485- to the RLDS- and the shield cable to the
RLDS GND.
4.1.1.2. COM Port Associations - E2
Versions 4.0 and Above
E2 PIB COM PORT ASSOCIATIONS
E2 Enclosure (Right Side)
Plug-In
COM3
Modem
Card
Serial Device
RS485 COM Ports
COM2
COM6
Figure 4-2 - Location of E2 COM Ports - E2 PIB Board (E2
version 4.0 and above)
An E2 has three COM ports that can be assigned for
MODBUS communication (COM2). COM ports can
only be used for one function; in other words, if
COM2 is set up as the I/O network, you cannot
connect MODBUS devices to COM2. Ensure your E2
is configured in E2 General Services (
Serial tab) to enable COM4 or COM6.
, Serial tab) to
COM1
Serial Device
RS232 Port
POWER INTERFACE BOARD
(PIB)
COM4
026-1309 Rev 11
,
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