Data Exchange with the SM 335
3-14
SM 335 – High-Speed Analog Input/Output Module for the SIMATIC S7-300
6ES7 335-7HG00-8BA1
Table 3-9
SM 335 parameters in HW Config
Parameters
SM 335
Parameters
Default
Value Range
Output
•
Method
Deactivated / Voltage
Voltage
•
Range
from – 10 V to + 10 V
from 0 V to + 10 V
*)
The setting 0.5 ms in HW Config means: Free Cycle
The setting 1 to 16 ms in HW Config means: Conditional Cycle
End-of-cycle interrupt enable
When you enable the end-of-cycle interrupt, the SM 335 generates a hardware
interrupt after A/D conversion of the active channels. You can use this to call OB
40 at fixed intervals. You can set the cycle time for the A/D conversion. The
SM 335 can generate the end-of-cycle interrupt starting from a cycle time for A/D
conversion of 1 ms.
(see Subsection 3.4.1, Hardware Interrupt)
Diagnostic interrupt enable
When diagnostic interrupts are enabled, the SM 335 generates a diagnostic inter-
rupt as soon as an error is found.
Enable diagnostics
If the diagnostics for inputs are enabled, the SM 335 checks for common-mode
errors and measuring range violations. When you enable diagnostics for the out-
puts, the SM 335 executes a short-circuit test on the outputs.
Open-wire test
You can activate the open-wire test for any analog input.
An open-wire test is possible in measuring ranges:
•
0 to 10 V (when the A/D conversion cycle time is 2 ms or longer)
•
4 to 20 mA (when the A/D conversion cycle time is 1.5 ms or longer or with
Free Cycle).
