Control bits from Bit8 to Bit15

Variable

ANZ_MDS_present

Indicates the presence of an MDS in the transmission window of the Read/Write MDS.

ANZ_MDS_present is indicated only if the user set the INPUT parameter

MDS_control.

Please note that when init_run is executed, the ANZ_MDS_present indication briefly

disappears even if an MDS stays permanently in the transmission window.

ANZ_cancel

The command executed last was a command interruption (cancel).The bit is set if the

IM displays a cancel acknowledgement by means of the cyclical word (refer to chapter

"Cyclical Control Word between Master and MOBY IM“. Reset is automatic by starting

a new command.

ANZ_ECC

If the ECC driver is switched on (INPUT parameter "ECC mode“ = TRUE), the bit

indicates that the data read by the MDS was corrected. ANZ_ECC is not an error

indication since the data is OK. ANZ_ECC indicates that in the near future the MDS

memory that was just processed may completely fail.

reserved

Presently not assigned

LR_bat

This bit is of significance only if at MOBY I processing takes place with the MDS507.

It indicates an empty MDS507 dialog battery. For all other MDSs, this bit can take on

any state.

battery_low

The back-up battery of the RAM MDS is below the threshold. Although it is still

possible to process several months at room temperature with the remaining capacity,

it is recommended to immediately change the battery or to replace the MDS if the

battery can’t be changed.

error

FB45 sets this bit if a command is concluded faulty. The error bit is the sum error bit

for all occurring errors. The exact cause for the error is located in the variable

error_MOBY, error_FB or error_BUS (refer also to chapter "Additional Indications“ or

chapter "Error Indications and Error Search“). Restarting the command resets the

error bit.

ready

Ready indication: after ready = TRUE was indicated, the error bit = FALSE has to be

polled. This ensures that the command was processed without error.

Please note:

The ready bit does not have to be set for starting init_run or cancel.

Notes

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TIA Training Document	Page 49 of 65
Module E11
Status: 01/2010	Radio Frequency Identification (RFID) with SIMATIC S7-300F-2PN/DP and
RF180C