121
CJ1W-SRM21 Master Unit for CJ-series PLCs
Section 4-3
recorded in the Special I/O Unit DM Area, so a standard status area check
using the program is required.
If a verification error occurs while using the Slave registration function, as it is
not a communications error, remote I/O communications will continue even if
communications stop mode is enabled.
Communications stop mode is set using pin 3 of the DIP switch on the Master
Unit. (pin 3 ON: communications stop mode, pin 3 OFF: normal communica-
tions mode)
Words Allocated for Slave
Registration and
Communications Stop
Mode
The words used for the Slave registration function and communications stop
mode are allocated in the Special I/O Unit DM Area according to the Master
Unit’s Special I/O Unit number, as shown below.
The contents from the first word to the first word +9 cannot be used for any
other purpose. They can be used, however, if the Slave registration function
and communications stop mode are not enabled.
First word
First word + 1
First word + 2
First word + 3
First word + 4
First word + 5
First word + 6
First word + 7
First word + 8
First word + 9
First word + 10
First word + 99
3
0
2
1
4
6
5
7
8
10
9
11
12
14 13
15
to
Output Slave Registration Table
(Used only when Slave registration function is enabled.)
First word = (unit number
×
100)
Input Slave Registration Table
(Used only when Slave registration function is enabled.)
Registered Slave Participation Monitoring Time
(Used only when Slave registration function is enabled.)
Reserved for system use (Cannot be used.)
Status Flags
(Used when Slave registration or communications stop
mode are enabled.)
Communications Stopped Node Number and Slave Type
(Used only when communications stop mode is enabled.)
Output Slave Verification Error: Slave Missing
(Used only when Slave registration function is enabled.)
Input Slave Verification Error: Slave Missing
(Used only when Slave registration function is enabled.)
Output Slave Verification Error: Unregistered Slave in Network
(Used only when Slave registration function is enabled.)
Input Slave Verification Error: Unregistered Slave in Network
(Used only when Slave registration function is enabled.)
Not used. (Can be used as work bits/words.)
Bit
CPU Unit-to-Master
Unit
(The contents of this
area is transferred to
the Master Unit from
the CPU Unit when
the power is turned
ON. When the
contents has
changed, turn ON
the power again.)
Master Unit-to-CPU
Unit
