Siemens SIMATIC User Manual

Digital modules
3.11 Digital input module SM 321; DI 16 x 24 VDC; with hardware and diagnostic interrupts (6ES7321-7BH01-
0AB0)
S7-300 Module data
86 Manual, 06/2017, A5E00105505-AJ
Operating mode: Isochronous mode
Conditions of isochronous mode:
Filtering and processing time T
WE
between reading actual values and writing these to the
transfer buffer
(the value defined for TWE
applies, irrespective of the enable status of diagnostics)
255 μs to 345 µs
includes an input delay time of
100 µs
T
DPmin
2.5 ms
Diagnostic interrupt
max. 4 x T
DP
Note
In "isochronous" mode, the input delay is
automatically set to 100 μs, regardless of the input
delay setting in STEP 7
Further information
You can find additional information on isochronous mode in the online help for STEP 7 and
in the operating instructions Distributed I/O System ET 200M.
(
http://support.automation.siemens.com/WW/view/en/1142798
)
3.11.2 SM 321; DI 16 x DC 24 V - Parameters
Programming
The general procedure of programming digital modules is described in the chapter
Programming digital modules (Page 58).
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.

Siemens SIMATIC Specifications

General

Brand	Siemens
Model	SIMATIC
Category	Control Unit
Language	English