Siemens SINUMERIK 828D Manual page 50

Error and system messages
7.2 Diagnostics via input image
Diagnostics via Status Bytes 0/1
In Status Byte 0, the set operating modes are reflected e.g. "0x55" if Control Byte 0 = 0x55
has been specified.
In the event of an error, the error bit is set in Status Byte 1 (bit 7). In the event of an error in
one channel, all channels are disabled.
Table 7- 6 Input image of analog inputs (excerpt)
Byte Bit7
m+0 0
m+1 Error bit
50
Bit6 Bit5
0 0
0 0
Bit4 Bit3
0 0
0 0
Bit3 Bit1
0 0
0 0
PP 72/48D 2/2A PN I/O module
Bit0
0
0
Manual, 03/2010