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D-8

SIMATIC TD 200 Operator Interface

C79000-G7076-C272-01

M Area Address

F4 F3 F2 F1

Shift

MBn

MSB

654 3 21

LSB

1 2 4 6 7 8 9

Byte 5

Offset

Figure D-6 Bits Set by Each Function Key

Message Address Bytes 6 and 7

Bytes 6 and 7 of the TD 200 parameter block define an integer-word offset in

V memory where the TD 200 looks for the first message. Valid offset values for

specific CPUs are defined in the

SIMATIC S7-200 Programmable Controller

System Manual

Note

Each 20-character message uses 20 VB memory locations; each 40-character

message uses 40 VB memory locations.

Message-Enable Address Bytes 8 and 9

Bytes 8 and 9 of the TD 200 parameter block define the integer-word offset in V

memory where the TD 200 looks for the first byte of the message-enable bits. Valid

offset values for specific CPUs are defined in the

SIMATIC S7-200 Programmable

Controller System Manual

For example: if you assign VB50 as the message-enable address, the first

message is enabled by bit V50.7, the second message by V50.6, the third

message by V50.5, and the eighth message by V50.0.

You must not use message-enable bits for any purpose other than enabling

messages. The TD 200 requires that you allocate full bytes for message-enable

bits.

Note

You can set or clear the message-enable bits from within your program. The

TD 200 may also clear the message-enable bit following an acknowledge or an

edit. See Section D.6 for more information.

TD 200 Parameters and Messa

Siemens SIMATIC TD 200 User Manual

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