Special Memory Location For The Modem Module - Siemens Simatic S7-200 System Manual

S7-200 Programmable Controller System Manual

Special Memory Location for the Modem Module

Fifty bytes of special memory (SM) are allocated to each intelligent module based on its physical position
in the I/O expansion bus. When an error condition or a change in status is detected, the module indicates
this by updating the SM locations corresponding to the module's position. If it is the first module, it updates
SMB200 through SMB249 as needed to report status and error information. If it is the second module, it
updates SMB250 through SMB299, and so on. See Table 10-10.
Table 10-10 Special Memory Bytes SMB200 to SMB549
Intelligent
Module in
Slot 0
SMB200 to
SMB249
Table10-11 shows the Special Memory data area allocated for the Modem module. This area is defined as
if this were the intelligent module located in Slot 0 of the I/O system.
Table 10-11 SM Locations for the EM 241 Modem Module
SM Address
SMB200 to
SMB215
SMB216 to
SMB219
SMW220
10
SMB222
SMB223
SMW224
304
Special Memory Bytes SMB200 to SMB549
Intelligent Intelligent
Module in Module in
Slot 1 Slot 2
SMB250 to SMB300 to
SMB299 SMB349
Description
Module name (16 ASCII characters) SMB200 is the first character.
"EM241 Modem"
S/W revision number (4 ASCII characters) SMB216 is the first character.
Error code
0000 – No error
0001 – No user power
0002 – Modem failure
0003 – No configuration block ID
0004 – Configuration block out of range
0005 – Configuration error
0006 – Country code selection error
0007 – Phone number too large
0008 – Message too large
0009 to 00FF – Reserved
01xx – Error in callback number xx
02xx – Error in pager number xx
03xx – Error in message number xx
0400 to FFFF – Reserved
Module status – reflects the LED status
MSB
7 6 5 4 3
F G H T R
F – EM_FAULT 0 – no fault
G – EM_GOOD 0 – not good
H – OFF_HOOK 0 – on hook,
T – NO DIALTONE 0 – dial tone
R – RING 0 – not ringing
C – CONNECT 0 – not connected
Country code as set by switches (decimal value)
Baud rate at which the connection was established (unsigned decimal value).
Intelligent Intelligent
Module in Module in
Slot 3 Slot 4
SMB350 to SMB400 to
SMB399 SMB449
LSB
2 1 0
C 0 0
1 – fault
1 – good
1 – off hook
1 – no dial tone
1 – phone ringing
1 – connected
Intelligent Intelligent
Module in Module in
Slot 5 Slot 6
SMB450 to SMB500 to
SMB499 SMB549