Chapter 9 Expansion Module
214
Summarize
Digital Input/Output module: SG2-8ER-A, SG2-8ER-D, SG2-8ET-D, SG2-8ER-24A
Analog Input module: SG2-4PT, SG2-4AI
Analog Output module: SG2-2AO
Communication module: MBUS, DNET, PBUS, EN01(TCP/IP), GSM
SG2
V
type, H type and K type can connect with expansion module. The maximal connectible number to the
expansion module is: 3 Digital IO modes, 2 Analog Output modes, 2 Analog Input modules (one 4PT and one 4AI)
and 1 Communication module. If the SG2 system is combined with digital IO, analog IO and communication module,
it must follow the standard arrangement, “SG2 + digital IO analog IO communication module”,
otherwise it can not work correctly.
※
SG2-4AI must be the last one of analog module.
※
To all expansion modules (except EN01 and GSM), the connecting way is the same as shown in above picture.
※
The method of EN01 module and GSM module connecting to SG2 is used programming cable PL01.
※
The number of digital module must be the same with the setting of IO number in the system setting. Otherwise
The SG2 will work incorrectly.
※
The scan time of SG2 main unit is about 2~20ms without any expansion module. The scan time will be longer
once connecting with expansion module. Connecting different expansion module gets different influence to
scanning cycle. For details, see the table below.
Expansion module
Add single module Influence
Max connecting num
Max influence to scanning cycle
Digital I/O module
scanning cycle +1ms
3
+1 ms*3=3ms
4PT module
scanning cycle +7ms
1
+7 ms*1=7ms
2AO module
scanning cycle +8ms
2
+8 ms*2=16ms
4AI module
scanning cycle +13ms
1
+13ms*1=13ms
Communication module
scanning cycle +4~16ms
5
+4~16ms*5=20~80ms
* When setting the preset value of a function block via communication module, the scan time extends about 50ms.
* When SG2 connects with 4PT module, the corresponding 4PT register in SG2 unit will be updated, one scan
cycle update one channel, so four Channels will be update within four scanning cycles.
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