IMO iSmart V4 - Default Chapter; Summarize

Chapter 9 Expansion Module 214
Summarize
Digital Input/Output module:SMT-MA-R8 , SMT-MD-8 ,SMT-MD-T8
Analog Input module: SMT-4PT, SMT-4AI
Analog Output module: SMT-2AO
iSmart 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). If the iSmart system is
combined with digital IO, analog IO and communication module, it must follow the standard arrangement, “SMT +
digital IO module + analog IO module ”, otherwise it cannot work correctly.
※ SMT-4AI must be the last one of analog module.
※
Mainframe + digital IO * 3 + 4AI*1
※ To all expansion modules, the connecting way is the same as shown in above picture.
※ The number of digital module must be the same with the setting of IO number in the system setting. Otherwise,
The iSmart will work incorrectly.
※ The scan time of iSmart 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 on
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
* When setting the preset value of a function block via communication module, the scan time extends about 50ms.
* When iSmart connects with 4PT module, the corresponding 4PT register in iSmart unit will be updated, one scan
cycle update one channel, so four Channels will be update within four scanning cycles.