GE 269Plus

GE Power Management 269Plus Motor Management Relay 4- 9
4 COMMUNICATIONS MEMORY MAP
4
c) SAMPLE PACKET WITH CRC-16
The following is a sample packet to read 102 bytes of actual values information from Slave number 64, starting
at address 00h. The CRC-16 code is accurate and this packet may be used for testing purposes.
ADDRESS = 40 hex
FUNCTION = 04 hex
START REG (HI) = 00 hex
START REG (LO) = 00 hex
REG. COUNT (HI) = 00 hex
REG. COUNT (LO) = 33 hex
CRC (LO) = BF hex
CRC (HI) = 0E hex
4.9 MEMORY MAP
The 269Plus memory map is broken up into two areas: the Actual Values address space and the Setpoints
address space. Each space has a total of 256 bytes. There are separate commands used to access the two
different spaces. The memory map is Table 4–2: 269PLUS MEMORY MAP on page 4–10. The data formats
are in Table 4–3: MEMORY MAP FORMAT CODES on page 4–24.
Since some Master PLCs only support command 03, the Actual Values registers may be accessed using a set-
point read command (03) beginning at offset 0200H (or 512 decimal). Therefore, accessing these registers
using a setpoint read command may be accomplished simply by adding 0200H (or 512 decimal) to the Actual
Values register in question.