42
10.4 Module “RWH_RW”, general description
This module allows the user to
●
read the UID of the ID tag over the Read-/Write head at process interface IO-1 … IO-4 . Two different
modes are available:
– Read UID once on request (Synchronous mode) .
– Read UID automatically whenever the evaluation unit detect a change of the UID data
(Asynchronous mode) .
●
read the User data of the ID tag over the Read-/Write head at process interface IO-1 … IO-4 . Two
different modes are available:
– Read User data of the ID-tag once on request (Synchronous mode) .
– Read User data of the ID-tag automatically whenever the evaluation unit detect a change of the UID
data (Asynchronous mode) .
● Write to the User data of the ID tag over the Read-/Write head at process interface IO-1 … IO-4.
● Write verified to the User data of the ID tag.
● Read the diagnostic information of the evaluation unit.
● Switch off and on the antenna field of the Read-/Write head
PLC process data output image (Module RWH_RW)
Byte no .
Bit
7
6
5
4
3
2
1
0
1
Res
DR
ER
UR
RD
WR
AO
Res
2
Data byte 1
3
Data byte 2
,,
…
19
Data byte 18
20
Data byte 19
Description Byte 1, “Control byte”:
Bit
Bit name
Description
0
Res
Reserved
1
AO
„Antenna field Off“ request
2
WR
WRite data to the User data of the ID tag
3
RD
ReaD data from the User data of the ID tag
4
UR
Mode “Access to the UseR data of the ID tag”
5
ER
Mode “Event controlled Reading of User memory of the ID tag”
6
DR
evaluation unit Diagnostics Read, set by the controller to fetch the
diagnostics, signaled by the evaluation unit in the Diag status bit
7
Res
Reserved
Remark:
The bits WR, RD, DR are edge controlled bits . The change from state “0->1” activates the command
request . The state “1” forces the evaluation unit to hold the response data or to execute the command
automatically . The state “0” forces the evaluation unit to set the data within the Process data input image
from Byte 2…20 to default value “0x00” .
It is not allowed to the set bit DR with the bits WR or RD or ER simultaneously, because the module
can handle only one command request . Otherwise an error message is created (Diag bit = 1) .
