BE SURE POWER IS DISCONNECTED PRIOR TO INSTALLATION!
FOLLOW NATIONAL, STATE AND LOCAL CODES.
READ THESE INSTRUCTIONS ENTIRELY BEFORE INSTALLATION.
The CIO-EN Module is a convenient and cost-effective Modbus/TCP and Modbus/RTU interface
capable of providing discrete control and monitoring of a SymCom overload relay over a Modbus or
Ethernet network. The CIO-EN is designed to provide the following benefits in both new and existing
installations:
reduced
field
wiring
greater operator efficiency
ease in system startup and commissioning
The CIO-EN Modbus I/O Module provides four (4) inputs and two (2) AC/DC rated relay outputs. It
can be DIN rail mounted or mounted directly to a back panel. The CIO-EN’s compact size, ease of
wiring, and Modbus communications capability makes the use of traditional discrete devices on
Modbus cost-effective and simple. The CIO-EN Module is compatible with SymCom’s Model 777-P
and 777-P1 overload relays. It simply connects to the side of the 777-P/P1 and in addition to the
extended I/O functions, permits remote monitoring and control of the 777-P/P1 over a Modbus
network. An additional remote reset input is available on the CIO-EN to reset a connected 777-P/P1.
CONNECTIONS
1. Mount the CIO-EN in a convenient location in a properly rated enclosure. The module can be
mounted to a back panel using screws or can be snapped onto a DIN rail.
2. For Modbus/RTU networks, connect the three Modbus wires (A, B, Shield) to the 5-pin connector
on the front of the CIO-EN module.
3. For communication with a SymCom overload, connect the CIO-EN to the side of a 777-P/P1 via
the 9-pin D-SUB connector located on the side of the CIO-EN.
NOTE: Do not plug a modem or any other PC compatible device directly into the 9-pin D-
SUB connector on the CIO-EN.
4. For Ethernet, connect an Ethernet cable to the Ethernet jack on the top of the CIO-EN module.
5. CIO-EN Inputs (refer to Figure 1): Connect one side of each input contact to C and connect the
other side to I1, I2, I3, or I4.
NOTE: CIO-EN input connections are dry contact connections only.
6. OUTPUT A, OUTPUT B and the REMOTE RESET connections are made on the top green
connector of the CIO-EN Module.
7. Power the device by connecting 24VDC to V+ and V- on the front green connector.
8. The MODBUS MODULE NETWORK STATUS LED indicates communication between the CIO-EN
and a Modbus master. The OVERLOAD COMM. STATUS LED indicates communication between
the CIO-EN and the 777-P/P1 overload.
9. The yellow LED on the Ethernet jack indicates the link between the CIO-EN and a computer/LAN
network. The green LED on the Ethernet jack indicates network activity between the CIO-EN and
a computer/LAN network.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
