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How many words does a DeviceNet slave use?

Last updated 08/19/2014 09:08 AM

Question

How many words does a HI 3000 DeviceNet slave use in the data table when configured as a slave and mapped as one more device controlled by a DeviceNet scanner in a PLC?

Answer

The number of DeviceNet words used by the HI 3000 which includes the HI 3010, HI 3030 and HI 4000 series units (which includes the HI 4050 and the HI 4060), when defined as a slave, is defined by the user. When your HI 3000 or HI 4000 series controller is enabled as a slave device the configuration software will give the user an opportunity to set the number of bytes for the polled input and output tables. This can be set from 0 to 125 or the max number of words the master scanner has available, whichever is lower. These words would then be mapped into the unit scan list and would then be available to be mapped into the master scanners' scan list. Typical maximum input and outputs words is 124. To keep the traffic to a minimum use as few words as possible.  The more words to collect, even empty words, will increase the scan time.

The HI 3000 series controller can be configured as a master as well. The terms "Master" and "Slave" are correct DeviceNet terms per OVDA protocol. Hardy does not mean to offend any of our customers when using those words, but we will continue to use them as they are the current terms.  The use of client and server result in the same connotation.  As terms are re-defined Hardy Process Solutions will endeavor to make corrections.