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Industry Automation and Drive Technologies - SCE

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Module E11

Status: 01/2010 Radio Frequency Identification (RFID) with SIMATIC S7-300F-2PN/DP and

RF180C

5.9 Command String

The user configures the command string by storing a corresponding number of UDT 21 one after the

other in a DB. All commands that are strung together have to be of the "Command" type "4x". The

last command of a string has to be of the type 0x. With it, the FB 45 recognizes the end of a

command string.

Example of a command string in DB47

Four data records are to be processed by an MDS.

The command structure is stored in the request DB, as shown below.

The destination and source data of the MDS are stored consecutively in DB48.

Read MDS address 0000 hex length 600

Read MDS address 1000 hex length 100

Read MDS address 1200 hex length 1

Write MDS address 1200 hex length 1

Notes

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Read command, another command follows

Write command, last command in string

Initial Value

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