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Featu res Section 1-1
1-1 Features
• The CQM1-B7A@@ Interface Unit incorporates the B7A transmission
operations for the CQM1H/CQM1 I/O Unit.
• The following five models of CQM1H/CQM1 B7A Interface Unit are avail-
able.
• Each Unit can be connected to the same number of points on 16-point
B7A Link Terminals as provided by the Unit. For example, two B7A Link
Terminal Units with 16 input points each can be connected to a CQM1-
B7A13.
• The transmission delay time can be switched between STANDARD (19.2
ms rated) or RAPID (3 ms rated).
• The data processing when a transmission error occurs can be switched
between HOLD (see note 1) and LOAD OFF (see note 2).
• The CPU treats the B7A Interface Units as the equivalent number of
points. It can handle remote I/O equipment, such as switches and lamps,
without recognizing communications.
Note 1. HOLD: When an error occurs, the input bit status immediately prior to the
error is held.
2. LOAD OFF: When an error occurs, all input bits turn off.
The B7A Link Terminal is a terminal board that incorporates a communication
function, connects to external I/O devices, and communicates with a PC over
a single cable, thus reducing wiring effort.
Differences Between
CQM1-B7A01 and
CQM1-B7A21
CQM1-B7A21 is an upgraded version of the CQM1-B7A01 and can replace
the CQM1-B7A01.
The features listed in the table below have been added to the CQM1-B7A21.
Note CQM1-B7A01 is no longer in production. Use the upgraded CQM1-B7A21.
Model No. of points
Input Output
CQM1-B7A21 16 16
CQM1-B7A13 32 0
CQM1-B7A03 0 32
CQM1-B7A12 16 0
CQM1-B7A02 0 16
Item CQM1-B7A01 CQM1-B7A21
Transmission delay time STANDARD only STANDARD/RAPID
switchable
Transmission error
processing
HOLD HOLD/LOAD OFF switchable
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