Siemens SIMATIC S7 System Manual

Special memory (SM) and system symbol names
D.28 SMB1100-SMB1399: EM (expansion module) hardware/firmware ID
S7-200 SMART
828 System Manual, V2.3, 07/2017, A5E03822230-AF
SM addresses for slot 2
Description
SMW1200
EM bus slot 2 vendor ID: 0x002A if a Siemens EM is present; 0x0000 if no EM is present
SMB1202 to SMB1221 EM bus slot 2 order ID (MLFB): ASCII characters, left-justified in field, padded with spaces
SMB1222 to SMB1237
EM bus slot 2 serial number: ASCII characters, left-justified in field, padded with spaces
SMW1238 EM bus slot 2 hardware version: Represents the hardware E-stand; range = 0x0001 to
0xFFFD
0x0000, 0xFFFE, and 0xFFFF are reserved values.
SMD1240 EM bus slot 2 firmware version:
• Byte 0: ASCII ‘V’
• Byte 1: Functional version
• Byte 2: Minor change version
• Byte 3: Bug fix version
SMW1244
EM bus slot 2 firmware version counter (range 0x0000 to 0x00FF)
SMW1246
Reserved, always 0x0000
SMW1248
EM bus slot 2 device type: I/O=0x0003, communications=0x0004, all other values reserved
SM addresses for slot 3
Description
SMW1250
EM bus slot 3 vendor ID: 0x002A if a Siemens EM is present; 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: ASCII ‘V’
• Byte 1: Functional version
• Byte 2: Minor change version
• Byte 3: Bug fix version
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

Siemens SIMATIC S7 Specifications

General

Brand	Siemens
Model	SIMATIC S7
Category	Controller
Language	English