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B7A Interface Unit Section 3-7
3-7-5 Common Specifications
3-7-6 I/O Memory Allocations
The B7A Interface Unit is a Basic I/O Unit. Each Unit is allocated four words in
the I/O Area (which starts at CIO 0000). The words are allocated according to
the mounting position of the Unit as shown in the following table.
Item Specifications
Applicable PLCs CJ Series
Unit classification CJ-series Basic I/O Unit
Transmission delay Standard (19.2 ms typical) or high-speed (3 ms typical),
switchable
(Switchable by using the setting switch on the front panel.
Settings are read when power is turned ON or Unit is
restarted.)
Factory setting: Standard (19.2 ms typical)
Note A transmission error will occur if B7A Link Terminals
with different transmission delay times are con-
nected to each other.
Transmission error
input status processing
HOLD (The bit status from immediately before the transmis-
sion error is held.)
Settings Front panel
Setting switch: Standard (19.2 ms typical) or
high-speed (3 ms typical), switchable
Indicators 5 LED indicators: RUN (B7A operating status), ERR1 (port
1 communications error), ERR2 (port 2 communications
error), ERR3 (port 3 communications error), ERR4 (port 4
communications error)
Front panel connection Connector with clamps
Current consumption 5 V DC: 70 mA max. (supplied from Power Supply Unit)
Weight 80 g max.
Port Input/output Allocated word
(n: First word
allocated to Unit)
CJ1W-B7A14 CJ1W-B7A04 CJ1W-B7A22
1 Input Output Output Word n
2 Input Output Output Word n+1
3 Input Output Input Word n+2
4 Input Output Input Word n+3
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