QUESTION:
What is the input delay of the technology digital inputs Length
Measurement, Reference Point Switch and Latch in CPU 31xC and C7
613/635?
ANSWER:
The technology digital inputs Length Measurement, Reference Point
Switch and Latch have an input delay of 48µs for the technological
functions "Count" and "Position".
The associated pin assignments and addresses of these digital
inputs are listed below for the CPU/C7 modules.
Note:
For evaluation of these digital inputs as default inputs, the input
delays that you have parameterized in the HW Config in the "Inputs"
tab in Properties DI/DO.
Reference documentation:
The description is based on the following sections in the manual
"CPU 31xC, Technological Functions" (Edition 05.2003), Entry ID.
12429336
|
Terminals for Positioning with Analog Output |
Section 3.1.3 |
|
Terminals for Positioning with Digital Output |
Section 4.1.3 |
|
Terminal Assignment |
Section 5.2.2 |
The C7 devices are described in the following manuals:
|
SIMATIC C7-613 Control System, Edition: 03/2003 |
Entry ID 13125532 |
|
SIMATIC C7-635 Control System, Edition: 02/2003 |
Entry ID 11559312 |
Technology digital inputs:
- Length measurement and reference point switch
These inputs are evaluated with the "Position"
function.
- The Length Measurement input is for storing the actual value of
the position at change of edge.
- The Reference Point Switch input is for selecting the zero mark
signal to be used for synchronization.
|
Module |
Connector |
Length Measurement |
Reference Point Switch |
|
Pin assignment |
Address |
Pin assignment |
Address |
|
CPU 314C-2 DP / PtP |
X2 |
5 |
DI +0.3 |
6 |
DI +0.4 |
|
C7 635 |
X11 |
4 |
DI +0.3 |
5 |
DI +0.4 |
Table 1: Pin assignment and addresses for the Length Measurement
and Reference Point Switch inputs
- Latch
This input is evaluated with the "Count"
function. The Latch input is for storing the counter value in the
case of a positive edge.
|
Module |
Connector |
Pin assignment |
Address |
|
CPU 312C |
X1 |
8 ... 9 |
DI +0.6 ... DI +0.7 |
|
CPU 313C |
X2 |
16 ... 18 |
DI +1.4 ... DI +1.6 |
|
CPU 313C-2 DP / PtP |
X1 |
16 ... 18 |
DI +1.4 ... DI +1.6 |
|
CPU 314C-2 DP / PtP |
X2 |
16 ... 19 |
DI +1.4 ... DI +1.7 |
|
C7 613 |
X11 |
13 ... 15 |
DI + 1.4 ... DI +1.6 |
|
C7 635 |
X11 |
13 ... 16 |
DI +1.4 ... DI +1.7 |
Table 2: Pin assignment and addresses for the Latch inputs
| 
Suggestion for the entry