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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

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