Read Monitoring Parameters from E3 with SLC-5/0x

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RSLogix 500 routine to read the first 20 parameters from an E3/E3+ overload relay on DeviceNet with an SLC-500 controller and 1747-SDN. This example uses the new DeviceNet Explicit Message (DEM) instruction introduced with OS302 Series C FRN10 firmware.

The 21st parameter is also important but will almost always be part of the I/O connection so we're only reading 20 parameters which fits more snugly into a data array.

This routine only reads from one E3+ device at Node 3 on the network.