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B7AC Interface Units Section 5-5
2. This bit is always 0 (OFF).
I/O Allocation Example
When the Master Unit is mounted in a C200HX/HG/HE PLC and fixed alloca-
tion is used for DeviceNet, IR area words IR 350 through IR 399 are allocated
to inputs from Slaves with node addresses 0 through 49.
If the B7AC Interface Unit’s node address is set to 01, the first allocated word
(m+0) will be IR 351. Ports A, B, and C will be allocated the following bits:
IR 35214 is the B7AC Communications Error Flag for the B7AC Interface
Unit.
Note If a communications error occurs in communications with a B7AC Link Termi-
nal Unit, normal communications will be restored automatically when the com-
munications error is resolved. The time required to restore communications
depends on the error continuation time (time from error occurrence to error
resolution), as shown below.
• Error continuation time less than 500 ms:
The B7AC Communications Error Flag will be turned OFF 500 ms after
the error occurred.
• Error continuation time greater than 500 ms:
The B7AC Communications Error Flag will be turned OFF after the er-
ror is resolved.
Port on B7AC
Interface Unit
Connector on B7AC Link
Terminal Unit
I/O bits allocated to Master Unit
Port A Input connector 0 to 9 IR 35100 to IR 35109
Port B Input connector 0 to 5 IR 35110 to IR 35115
Input connector 6 to 9 IR 35200 to IR 35203
Port C Input connector 0 to 9 IR 35204 to IR 35213
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0
m+0: Wd 351
m+1: Wd 352
ERR
B7AC Communications Error Flag B7AC Unit connected to port A
B7AC Unit connected to port B
B7AC Unit connected to port C
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