Eaton Electrical D77A Theory of Operation, Out-of-box Default Operation, Typical Application

Intelligent Technologies (IT.) D77A I/O Module Products

Theory of Operation

The IT. D77A I/O system consists of a collection of input and output modules connected together by QCPort to a network adapter. The network adapter connects to the industrial network where the controller usually is a PLC or DCS. The input modules collect digital or linear signals from sensors (limit switches, proximity sensors, temperature transmitters, etc.) and deliver these data to the control device. In the control device, input data values are placed in data registers. Based on the input data, the control algorithm manipulates values in the output registers. With each scan of the network, the input and output data registers are updated. With this update, the output modules have their digital or linear data changed to reflect the control algorithm found in the control device software. The output devices (solenoid valves, motor starters, temperature gauges, etc.) effect changes to the machinery being controlled.

Out-of-box Default Operation

When the IT. D77A I/O modules are properly installed and each has a properly configured Group ID (address), no additional configuration is needed for standard operation. To customize the configuration, refer to Configuration on page 34. After customizing the configuration, the system can be restored to the default out-of-box configuration without a software tool such as CH Studio by following these steps.

1.Using a screwdriver, rotate the Group ID Switch from the “0” position to the “1” position.

2.Repeat this action five times.

The status LED rapid flashes, signaling that the system is reset to the out-of-box default settings.

Typical Application

Figure 16 illustrates a typical D77A I/O module application this is integrated with a number of IT. starters with QSNAPs. In this example, a D77A I/O is part of a larger system where motor control and I/O are required within a single panel. On the same QCPort connection, both the I/O and the motor control are connected to a single network Adapter. The network adapter then represents the D77A I/O and motor control as remote I/O, allowing for control and monitoring of the QCPort devices.

b	e
a	d
	f
c
	D77A-003

Figure 16: Panel Layout: Adapter, I/O and QSNAP

a)PC or PLC Connection

b)I/O Modules

c)QCPort Connection

d)IT. Starters with QSNAPs

e)Power Tap/Terminator Resistor

f)24 V DC Power Supply

22 For more information visit: www.EatonElectrical.com MN05002001E