Automationdirect.com DirectLOGIC DL205 Series User Manual page 535

Chapter 5: Intelligent Box (IBox) Instructions
ECRX Example (cont'd)
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Rung 2: Using ECOM100# K0, read X0-X7 from Slave K7 and write them to slave K5 as fast
as possible. Store them in this local PLC in C200-C207, and write them to C300-C307 in
slave K5.
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Both the ECRX and ECWX work with the ECOM100 Config IBox to simplify all
networking by handling all of the interlocks and proper resource sharing. They also provide
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very simplified error reporting. You no longer need to worry about any SP "busy bits" or
"error bits", or what slot number a module is in, or have any counters or shift registers or any
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other interlocks for resource management.
In this example, SP1 (always ON) is driving both the ECRX and ECWX IBoxes in the same
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rung. On the scan that the Network Read completes, the Network Write will start that same
scan. As soon as the Network Write completes, any pending operations below it in the
program would get a turn. If there are no pending ECOM100 IBoxes below the ECWX,
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then the very next scan the ECRX would start its request again.
Using the ECRX and ECWX for all of your ECOM100 network reads and writes is the
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fastest the PLC can do networking. For local Serial Ports, DCM modules, or the original
ECOM modules, use the NETCFG and NETRX/NETWX IBoxes.
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DL205 User Manual, 4th Edition, Rev. B