Digital modules 
3.10 Digital input module SM 321; DI 16 x 24 VDC; with hardware and diagnostic interrupts  
S7-300 Automation System Module data 
Manual,  08/2006, A5E00105505-04 
3-27 
3.10.2  Parameters of SM 321; DI 16 x DC 24 V 
Programming 
The general procedure for programming digital modules is described in 
Configuring digital 
modules
.  
Parameters of SM 321; DI 16 x DC 24 V 
The table below shows an overview of configurable parameters and their default settings for 
SM 321; DI 16 x DC 24 V. 
The default settings apply if you have not set any parameters in STEP 7. 
Table 3-8  Parameters of SM 321; DI 16 x DC 24 V 
Parameters  Range of values  Default  Parameter 
type 
Scope 
Enable 
•  Diagnostic interrupt 
•  Hardware interrupt 
 
Yes/no 
Yes/no 
 
No 
No 
 
Dynamic 
 
Module 
Input delay/voltage type  0.1 ms (DC) 
0.5 ms (DC) 
3 ms (DC) 
15 ms (DC) 
20 ms (DC/AC) 
(DC)  static  Module 
Diagnostics 
•  Encoder supply missing 
•  Wirebreak 
 
Yes/no 
Yes/no 
 
No 
No 
 
static 
 
Channel group 
Hardware interrupt trigger 
•  Positive edge 
•  Negative edge 
 
Yes/no 
Yes/no 
 
No 
No 
 
Dynamic 
 
Channel group 
Allocating the encoder supplies to channel groups 
The module's two encoder supplies, supply power to two channel groups: Inputs 0 to 7 and 
inputs 8 to 15. You also configure diagnostics for the encoder supply at those two channel 
groups. 
(6ES7321-7BH01-0AB0)