220
B7AC Interface Units
Section 5-5
B7AC Transmission Delay Setting (Pins 1 to 3)
Pins 1 to 3 set the transmission delay time for communications with the B7AC
Link Terminal Unit at each port, as shown in the following table. These pins
are set to ON (high-speed) at the factory.
B7AC Communications Error Signal Setting
Pins 6 to 8 specify whether an error signal (notification) will be sent to the
Master Unit when an error occurs in B7AC communications through the corre-
sponding port. These pins are set to ON (send error signal) at the factory
If an error occurs in a port and the corresponding pin is ON (send error sig-
nal), the B7AC Communications Error Flag will be turned ON in the words
allocated in the Master Unit. See
I/O Allocation
below for details on the loca-
tion of the B7AC Communications Error Flag.
Note
1.
Always turn OFF the Unit’s power supply (including the communications
power supply) before changing any DIP switch settings.
2.
Set the appropriate transmission delay time for the B7AC Link Terminal
Unit connected to each port.
3.
Always turn OFF the B7AC communications error signal setting for a port
if there isn’t a B7AC Link Terminal Unit connected to the port.
I/O Allocation
The B7AC Interface Unit is allocated two input words in the Master Unit. The
following table shows the usage of these two words when word “m+0” is the
first word allocated and “m+1” is the second word allocated.
Note
1.
Bit 14 of word m+1 is the B7AC Communications Error Flag for the B7AC
Interface Unit. This flag will be turned ON if there is a communications error
in any one of the ports set to “send error signal” in pins 6 to 8 of DIP switch
2. The flag will be reset to 0 automatically when the communications error
is resolved.
Pin 1
Pin 2
Pin 3
Transmission delay time
Port A
Port B
Port C
OFF
OFF
OFF
19.2 ms typical
ON
ON
ON
3 ms typical (factory setting)
Pin 6
Pin 7
Pin 8
B7AC communications error signal
setting
Port A
Port B
Port C
OFF
OFF
OFF
Do not send error signal.
ON
ON
ON
Send error signal. (factory setting)
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
Word m+0, bits 00 to 09
Port B
Input connector 0 to 5
Word m+0, bits 10 to 15
Input connector 6 to 9
Word m+1, bits 00 to 03
Port C
Input connector 0 to 9
Word m+1, bits 04 to 13
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
5
Wd m+0
4
ERR
3
2
1
0
9
8
7
6
5
4
3
2
1
0
Wd m+1
9
8
7
6
5
4
3
2
1
0
9
8
7
6
Bit:
Inputs for B7AC Unit
connected to port B
Inputs for B7AC Unit
connected to port A
Inputs for B7AC Unit
connected to port C
Inputs for B7AC Unit
connected to port B
No
te
1
N
o
te
2
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