SLC explicit messaging

[hokie]

Does anyone know if there is an integrated function for handling explicit messaging in the SLC, like the MSG command in the logix systems?
Last time I did this you had to build your own message and stick it in some specific location in the M0 file and wait for response to show up in M1.

 

[Ken Roach]

Dem,cem,eem

SLC-5/03, /04, /05 controllers added new DeviceNet Explicit Message (DEM), ControlNet Explicit Message (CEM), and EtherNet/IP Explicit Message (EEM) instructions in Series C, FRN10 firmware. Most SLC-5/0x controllers built since 1994 can be upgraded to this version of firmware.

DEM requires the 1747-SDN, of course, and CEM requires the 1747-SCNR. EEM runs through the Ethernet port of the SLC-5/05 only.

The instruction basically hides the creation of the array of data and the copying of the array into the M0/M1 files. It's a lot easier than the old method.

It's still not as functional as the Logix instruction (shorter data lengths, etc) but its a big ease-of-use improvement.