Step 4: If all of the previous steps have been satisfied, then examine the “LINK” light on the Ethernet module. It should not be red. If it is, then first make sure that the Ethernet cable is hooked up at both ends. Remember that you must use straight through standard CAT5 cables when going between the blender and a hub or switch. If you are trying to go directly from the blender to a PC without using a hub or switch, then you need to use a Crossed Ethernet cable. At this point you more than likely have a cable problem and should test this. To test purchase a standard CAT5 cable that already has the ends connected and a standard hub or switch (this can be purchased from Best Buy, Circuit City, CompUSA, or Radio Shack). At the blender, power up the hub and connect the blender using the new cable to one of the middle ports on the hub (say port 3 on a
Step 6: If you have LINK lights on all units (including the PC) and no fault link lights on the PLCs, but you still cannot establish communications, then we need to check the PC’s network properties. If this computer resides on your plant network and was set up by your IT department, then you will need to involve them for further assistance with your problem. Instruct your IT department that the blenders must have a fixed IP, but the PC can have a dynamic IP. All subnet masks for the PC and the blenders need to be 255.255.255.0. They might not have the startup script correct for your PC. If the blenders and PC all reside on a separate network that has nothing to do with your plants LAN then we need to check the PC’s network properties (see “Chapter1 Networking instructions for the Sterling SGB Blender” for
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