Process image

Process image 1:

 

Status
Status word, see below.

IO Inputs
In this PDO you can create the data structure for cyclic reading from the NOVRAM memory.
See chapter Cyclic memory access.

Control
Control word, see below.

IO Outputs
In this PDO you can create the data structure for cyclic writing to the NOVRAM memory.
See chapter Cyclic memory access.

Status word

The status word (SW) is located in the input process image, and is transmitted from the box to the controller.

Bit

SW.15

SW.14

SW.13

SW.12

SW.11

SW.10

SW.9

SW.8

Name

Acyclic operation, 4 bit counter increments with each successful save

-

-

-

-

Bit

SW.7

SW.6

SW.5

SW.4

SW.3

SW.2

SW.1

SW.0

Name

-

-

-

-

-

-

-

Cyclic operation with handshake, "Writing Started"

Control word

The control word (CW) is located in the output process image, and is transmitted from the controller to the box.

Bit

CW.15

CW.14

CW.13

CW.12

CW.11

CW.10

CW.9

CW.8

Name

-

-

-

-

-

-

-

-

Bit

CW.7

CW.6

CW.5

CW.4

CW.3

CW.2

CW.1

CW.0

Name

-

-

-

-

-

-

-

Cyclic operation with handshake, "Start Writing"