snap ethernet-based i/o units protocols and programming guide
snap ethernet-based i/o units protocols and programming guide
snap ethernet-based i/o units protocols and programming guide
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APPENDIX A: SNAP ETHERNET-BASED BRAIN MEMORY MAP<br />
Starting Address Length Type Description<br />
FFFF F038 0010 4 UI Set watchdog time in milliseconds (unsigned integer).<br />
0 disables watchdog.<br />
FFFF F038 0014 4 UI Set TCP/IP minimum Response Timeout (RTO) in milliseconds. For<br />
SNAP Ultimate <strong>and</strong> SNAP Simple brains, the default is a minimum<br />
100 msec between retries.<br />
For SNAP Ethernet brains, the default is a minimum 3000 msec<br />
between retries. For a high-speed application such as motion<br />
control, you can write a lower minimum RTO to this address.<br />
FFFF F038 0018 4 UI Set TCP/IP initial RTO<br />
FFFF F038 001C 4 UI Set TCP/IP number of retries<br />
FFFF F038 0020 4 UI TCP idle session timeout in milliseconds. 0 = disable<br />
Last valid address for this area: FFFF F038 0023<br />
Modbus Configuration—Read/Write<br />
Use this area of the memory map for changing the format of Modbus floats. After you change<br />
format, be sure to store the information to flash using the Status Write area of the brain<br />
(page 107). The Modbus memory map <strong>and</strong> information are in the SNAP Ethernet-Based I/O Units<br />
User’s Guide.<br />
Starting Address Length Type Description<br />
FFFF F039 0000 4 UI Modbus float format (unsigned integer)<br />
0x00000000 = Big Endian<br />
0x00000001 = Big Endian, word swapped. Most significant bit of float<br />
is in most significant register.<br />
Last valid address for this area: FFFF F039 0003<br />
108 SNAP Ethernet-Based I/O Units Protocols <strong>and</strong> Programming Guide