Siemens SINUMERIK 808D Commissioning Manual

Commissioning Manual
01/2017
255
11
Measurement functions
11.1
Fast inputs and outputs
The fast input/output interface (X21) provides 3 digital inputs and 1 digital output:
Illustration
Pin
Signal
Variable
Description
4 DI1 $A_IN[1] Fast input with address DB2900.DBX0.0, for
connection to probe 1
5 DI2 $A_IN[2] Fast input with address DB2900.DBX0.1, for
connection to probe 2
6
DI3
$A_IN[3]
Fast input with address DB2900.DBX0.2
7 DO1 $A_OUT[1] Fast output with address DB2900.DBX4.0
PLC interface address
DB2900
Signals from fast inputs and outputs [r]
NCK → PLC interface
Byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 Actual value for digital NCK inputs
Input 8
Input 7
Input 6
Input 5
Input 4
Hardware input
4
Setpoint for digital NCK outputs
Output 8 Output 7 Output 6 Output 5 Output 4 Output 3 Output 2 Hardware
output
●
Fast inputs
In the PLC application program, you can directly read each bit value from the address DB2900. In a part program, you
can read the fast input value via system variable $A_IN[x].
●
Fast output
From the address DB2900.DBX4.0 you cannot assign a value to the fast output; otherwise, the PLC application program
will stop with an error. However, you can assign a value to the fast output from address DB2800.DBX5.0 and
DB2800.DBX6.0.
In the PLC application program, you can trigger the address DB2800.DBX5.0 with a rising edge or a negative edge at the
address DB2800.DBX6.0, and thus the address DB2900.DBX4.0 will vary with the address DB2800.DBX6.0.

Siemens SINUMERIK 808D Specifications

General

Brand	Siemens
Model	SINUMERIK 808D
Category	Control Unit
Language	English