Atlas Copco PowerMACS 4000, User Manual

Page: 434 / 668

Peripheral Devices
434 9836 3521 01

ASCII : The optional number part is assumed to be a four character string consisting of decimal
digits only. That is, the decimal value 1234 is formatted as four consecutive bytes having the
values 0x31, 0x32, 0x33, 0x34 with the first byte (0x31) is located at lowest address.
The value read from the tag is converted to a four character decimal number (example: value 47 gives the
string "0047"). Leaving either
Start address 2 or Stop address 2 blank disables reading of the optional
number part .
If the optional number part is used it is concatenated to end of the main part before the resulting ID string
is sent to the station and the PowerMACS PLC.
Example: If the main part is the string "ABCDE" and decimal value 47 is read as optional number part the
resulting ID String is "ABCDE0047". This string is sent to the station and PLC as a response
to an IDREAD (PLC output) request.
Writing result data:
Start address and Stop address defines the address area of the tag where result data is written if a
reporter is assigned to the device. the offsets are relative to Start address .
Limitations:
A V600 controller cannot be shared between different ID devices. Every TC that should write to a tag must
have a separate V600 controller.
Only one of the V600 controllers' antennas can be used. Which antenna to use is configurable.
The system configuration for 1 to N connections (available only for V600-CA2A) is not supported.
The command used for reading and writing data in the EM is Read (RD) and Write (WT), which means
that there is no support for Auto Read (AR), Auto Write (AW), Polling Auto Read (PR) or Polling Auto
Write (PW).
Since auto reading is not supported an external signal has to be used to inform the PLC that the tag is in
place for reading or writing.