BASEstartm Classic DAS
for Allen-Bradley
Data Highwaytm Protocol
Installation and User's Guide
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Internal Storage File Addresses

Table 3-20 describes address specifications and data types for internal storage file addresses. Internal storage file addresses are supported only for the PLC-5/250 and are specified in octal.

Table 3-20 Internal Storage File Addresses
Address Format Comment
IS:rr Word Internal storage file word
IS:rr/bb Bit Internal storage file bit

Shared Data File Addresses

Table 3-21 describes address specifications and data types for shared data file addresses. Shared data file addresses are supported only for the PLC-5/250.

Table 3-21 Shared Data File Addresses
Address Format Comment
mSDf:nn Word Shared data file word
mSDf:nn/bb Bit Shared bit

Block Transfer Data Addresses

Table 3-22 describes address specifications and data types for block transfer data addresses. Block transfer data addresses are supported only for the PLC-5/250.

Table 3-22 Block Transfer Data Addresses
Address Format Comment
mBTDf:nn Word Block transfer data file word
mBTDf:nn/bb Bit Block transfer data bit

String Data Addresses

Table 3-23 describes address specifications and data types for string data addresses. String data addresses are supported only for the PLC-5/250.

Table 3-23 String Data Addresses
Address Format Comment
mSTf:nn String Entire string structure
mSTf:nn.LEN Word String length
mSTf:nn.DATA Array[82]:byte String data---up to 82 bytes

Adapter Status File Addresses

Table 3-24 describes address specifications and data types for adapter status file addresses. Adapter status file addresses are supported only for the PLC-5/250 and are specified in octal.

Table 3-24 Adapter Status File Addresses
Address Format Comment
ASf:rr Array[4]:byte Entire adapter status structure
ASf:rr.RC Byte Adapter status retry count
ASf:rr.OI 1 Bit Adapter status output inhibit
ASf:rr.CF 1 Bit Adapter status fault

1 Control bits should be treated as read only and modified only under PLC program control. Modifying these bits from a computer can give unpredictable results.

Message Addresses

Table 3-25 describes address specifications and data types for message addresses. Message addresses are supported only for the PLC-5/250.

Table 3-25 Message Addresses
Address Format Comment
mMSGf:nn Array[112]:byte Entire message structure
mMSGf:nn.ERR Word Message error code
mMSGf:nn.ERR/bb Bit Message error code bit
mMSGf:nn.RLEN Word Message request length
mMSGf:nn.RLEN/bb Bit Message request length bit
mMSGf:nn.DLEN Word Message done length
mMSGf:nn.DLEN/bb Bit Message done length bit
mMSGf:nn.EN 1 Bit Message enable bit
mMSGf:nn.ST 1 Bit Message start transmission bit
mMSGf:nn.AD 1 Bit Message done bit
mMSGf:nn.AE 1 Bit Message error bit
mMSGf:nn.CO 1 Bit Message continuous bit
mMSGf:nn.EW 1 Bit Message enabled waiting
mMSGf:nn.DN 1 Bit Message synchronization done
mMSGf:nn.ER 1 Bit Message synchronization error

1 Control bits should be treated as read only and modified only under PLC program control. Modifying these bits from a computer can give unpredictable results.

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