Prosoft-technology 5204SE-MNET-PDPMV1 Instrukcja Użytkownika Pobierz pdf (Strona 152)

5204SE-MNET-PDPMV1 ♦ ProLinx Gateway Reference

Modbus TCP/IP to PROFIBUS DP-V1 Pass-Through Master User Manual

Page 152 of 235 ProSoft Technology, Inc.

December 22, 2009

MNETDPV1_Outputs Variable - Quantum

This variable is an array of 1536 bytes. It is used to hold up to 768 words (1536

bytes) of PROFIBUS cyclic output data to be sent to slaves on the PROFIBUS

network.

The order of data in this array will match the order in the PCB memory maps you

exported and/or printed. The following illustration shows a typical memory map.

The PCB table lists usage in words rather than bytes, where one (1) word equals

two (2) bytes. In this example, there are only 32 total words or 64 total bytes of

PROFIBUS output data configured of the 1536 bytes available that could be

used. The first 64 bytes (32 words) this array will hold data to be sent to Slave

Address 1, Slot 0.

You should also notice that the native storage size in the module's memory is 16-

bit or 2-byte word registers. When you have more than one slave device, this

data is 'byte-packed' with no extra blank bytes inserted just so the data for each

slave address can begin on an even-numbered, low-order byte boundary.

1 2 ... 147 148 149 150 151 152 153 154 155 156 157 ... 234 235

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Prosoft-technology 5204SE-MNET-PDPMV1 Instrukcja Użytkownika Strona 152