Siemens Simatic S7 Series

Special memory (SM) and system symbol names
D.28 SMB1100-SMB1399: EM (expansion module) hardware/firmware ID
S7-200 SMART
690 System Manual, 09/2015, A5E03822230-AC
SM addresses for slot 3
Description
SMW1250 EM bus slot 3 vendor ID: Set to 0x002A if a Siemens EM is present and 0x0000 if no EM is
present
SMB1252 to SMB1271 EM bus slot 3 order ID (MLFB): ASCII characters, left-justified in field, padded with spaces
SMB1272 to SMB1287
EM bus slot 3 serial number: ASCII characters, left-justified in field, padded with spaces
SMW1288 EM bus slot 3 hardware version: Represents the hardware E-stand; range = 0x0001 to
0xFFFD (0x0000, 0xFFFE, and 0xFFFF are reserved values)
SMD1290 EM bus slot 3 firmware version: Byte 0 is ASCII ‘V’; byte 1=functional version, byte 2=minor
change version, byte 3=bug fix version (range of bytes 1-3 = 0x00 to 0xFF)
SMW1294
EM bus slot 3 firmware version counter (range 0x0000 to 0x00FF)
SMW1296
Reserved, always 0x0000
SMW1298
EM bus slot 3 device type: I/O=0x0003, communications=0x0004, all other values reserved
SM addresses for slot 4
Description
SMW1300 EM bus slot 4 vendor ID: Set to 0x002A if a Siemens EM is present and 0x0000 if no EM is
present
SMB1302 to SMB1321
EM bus slot 4 order ID (MLFB): ASCII characters, left-justified in field, padded with spaces
SMB1322 to SMB1327
EM bus slot 4 serial number: ASCII characters, left-justified in field, padded with spaces
SMW1338 EM bus slot 4 hardware version: Represents the hardware E-stand; range = 0x0001 to
0xFFFD (0x0000, 0xFFFE, and 0xFFFF are reserved values)
SMD1340 EM bus slot 4 firmware version: Byte 0 is ASCII ‘V’; byte 1=functional version, byte 2=minor
change version, byte 3=bug fix version (range of bytes 1-3 = 0x00 to 0xFF)
SMW1344
EM bus slot 4 firmware version counter (range 0x0000 to 0x00FF)
SMW1346
Reserved, always 0x0000
SMW1348
EM bus slot 4 device type: I/O=0x0003, communications=0x0004, all other values reserved
SM addresses for slot 5
Description
SMW1350 EM bus slot 5 vendor ID: Set to 0x002A if a Siemens EM is present and 0x0000 if no EM is
present
SMB1352 to SMB1371
EM bus slot 5 order ID (MLFB): ASCII characters, left-justified in field, padded with spaces
SMB1372 to SMB1387
EM bus slot 5 serial number: ASCII characters, left-justified in field, padded with spaces
SMW1388 EM bus slot 5 hardware version: Represents the hardware E-stand; range = 0x0001 to
0xFFFD (0x0000, 0xFFFE, and 0xFFFF are reserved values)
SMD1390 EM bus slot 5 firmware version: Byte 0 is ASCII ‘V’; byte 1=functional version, byte 2=minor
change version, byte 3=bug fix version (range of bytes 1-3 = 0x00 to 0xFF)
SMW1394
EM bus slot 5 firmware version counter (range 0x0000 to 0x00FF)
SMW1396
Reserved, always 0x0000
SMW1398
EM bus slot 5 device type: I/O=0x0003, communications=0x0004, all other values reserved