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Siemens Simatic S7-400 User Manual

Page 579

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Diagnostic Data of the Signal Modules

B-5

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

Bytes 4 to 8 of the SM 421; DI 16

24 VDC

Byte 4

7 6

0

5 4 3 2 1

Byte 5

7

0

Channel type B#16#70: digital input

Number of diagnostics bits that the module
outputs per channel: 8 bits long

Byte 6

7

0

Number of channels of the same
type in one module: 16 channels

Byte 7

7 6

0

Channel error, channel 0

Channel error, channel 1

Channel error, channel 6

Channel error, channel 7

5 4 3 2 1

...

0

Byte 8

7 6

0

Channel error, channel 14

Channel error, channel 15

5 4 3 2 1

...

Channel error, channel 8

Channel error, channel 9

Figure B-3

Bytes 4 to 8 of the Diagnostic Data of the SM 421; DI 16 x 24 VDC

Bytes 9 to 24 of the SM 421; DI 16

24 VDC

Data record 1 with bytes 9 to 24 contains the channel-specific diagnostic data. The
figure below shows the assignment of the diagnostic byte for a channel of the
module.

7 6

0

Sensor supply missing

5 4 3 2 1

0

0

Configuring/parameter assignment error

Wire break

0 0 0

Figure B-4

Diagnostic Byte for a Channel of the SM 421; DI 16 x 24 VDC

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