Specifications

28) Data in Poll Command: (class=66, instance=1, attribute=15) When data in the

poll command is set to 1 (enabled), the Transmit Data packet (bytes) of a

particular instance is added to the Poll Consume Size. Any particular Tx

instances, which are unused must be disabled (Not in Poll Command.) The data in

the poll command attribute must be enabled in order to establish an I/O

connection with the master scanner (see Output Memory Table of A-B 1747-SDN

mapping.)

Serial Receive/Transmit & I/O Mapping:

The Input words data memory table in 1747-SDN master scanner module

ranges from I:1.0 ~ I:1.31. The Output words data memory table range from O:1.0

~ O:1.31. The 1747-SDN can store 31 words or 62 bytes of serial receive or

transmit data. Words I:1.0 & O:1.0 are reserved for the data block transfer

between the 1747-SDN master scanner and the PLC processor unit.

M-File input mapping is similar to discrete input memory mapping. M-file

input table in 1747-SDN master scanner module ranges from M1:1.0 ~ M1:1.149

words. The output table ranges from MO:1.0~MO:1.149 words. Total is 150

words or equivalent to 300 bytes for each input and output I/O mapping. The

serial data sent or received by the CDN366 cannot be viewed on the M-file. M-

file does not exist in data memory table. The serial data in the M-file must be

copied to a N integer file in order to be able to view the data.

Receive Handshaking & I/O Mapping:

The Receive Toggle byte for instances 1~8 is mapped in Input word I:1.1

word bits 8~15. Each receive toggle bit is controlled by a single instance of

receive object. When Instance 1 is used for serial reception, bit 8 at Input I:1.1

would be used for receive toggle bit. Bit 9 would be use for receive toggle bit for

instance 2. Bit 14 would be use for receive toggle bit for instance 7. The input M-

File mapping is similar to discrete input mapping.

The Receive Acknowledge byte for instances 1~8 are mapped in Output

O:1.1 word bits 8~15. The receive acknowledge bits are configured similar to the

receive toggle bits. Each receive acknowledge bit represents a single instance of

the receive object. When Instance 4 is used for serial reception, bit 11 at Output

O:1.1 would be used for acknowledging the message received. Bit 11 would

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

I:1.1 Inst. 8 Inst. 7 Inst. 6 Inst. 5 Inst. 4 Inst. 3 Inst. 2 Inst. 1 Inst. 8 Inst. 7 Inst. 6 Inst. 5 Inst. 4 Inst. 3 Inst. 2 Inst. 1

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

O:1.1 Inst. 8 Inst. 7 Inst. 6 Inst. 5 Inst. 4 Inst. 3 Inst. 2 Inst. 1 Inst. 8 Inst. 7 Inst. 6 Inst. 5 Inst. 4 Inst. 3 Inst. 2 Inst. 1

Receive Toggle bits 8~15 (1 byte) Transmit Acknolwedge bits 0~7 (1 byte)

Receive Acknowledge bits 8~15 (1 byte) Transmit Toggle bits 0~7 (1 byte)