Many industries use a sump pit to collect waste water from machines, waste cutting oil, and toxic solutions from the production line. When the level of the liquid in the sump pit reaches a certain level, the liquid in the sump pit must be pumped out to a holding tank. If the system is set up as an open-loop system, engineers must periodically check the level of the sump pit and then turn the pump on when the sump pit is nearly full, and turn it off when the pump pit is nearly empty.

System description and requirements
A better option is to use closed-loop control through a centralized SCADA monitoring system. In this case, a sensor is connected to a controller to turn the pump on and off automatically. The sensor and control mechanism should be able to detect the liquid level and start or stop the pumping action when the float that senses the liquid level gets too high or too low. Multiple pump control and alarm generation are also included as part of the control system. Alarm indicators are triggered when the pump starts, or when the level reaches a high level, and sump pump control is done automatically, or manually from a remote location.

Moxa's solution
The ioLogik E2242 is an Active Ethernet I/O Server that provides a combination of I/O options. The 4 analog inputs can connect to liquid level sensors based on either voltage or electric current; the 12 built-in DIOs are configurable and provide the best flexibility for connecting to multiple input switches or triggering pumps and alarms. With the world's easiest to program local control logic, called Click&Go, users can easily program the ioLogik E2242 to act as a front-end pump controller and alarm generator to control the action of the pumps automatically, generate alarms, and send the most up-to-date status to the central SCADA system or by e-mail to the field engineers.

Network System Diagram:

Products
ioLogik E2242: Active Ethernet I/O with 4 analog inputs and 12 configurable DIO

Benefits
The Moxa ioLogik E2242 is the best fit for sump pump control systems:

• Equipped with both analog inputs and digital input/output channels
• Easy IF-THEN style control logic with Click&Go replaces a PLC or RTU
• Local and remote Ethernet control can be used simultaneously
• Alarm messages can be generated by TCP/UDP/SNMP Trap or e-mail
• Compact size and cost-effective

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