Toshiba V Series User Manual page 47

(2) Setting the head address
The talker area head address is set using the talker block head setting switch
(TBH/TBL) located on the side face of the module, while the listener area head
address is set using the listener block head setting switch (LBH/LBL). Set these
switches to block numbers described in the previous item.
Therefore, the head addresses are addresses in 2 words in Area 1, while they are
addresses in 32 words in Area 2. The relationship between the block numbers and the
addresses in the common memory area is as follows:
Area 1: common memory address = [block number] x [2 (decimal)]
Area 2: common memory address = [block number] x [32 (decimal)]
(3) Lengths of the talker and listener areas
The heads of the talker and listener areas are determined using the talker block
head/listener block head setting switches as described in the previous item.
The talker and listener area lengths are determined by the types of I/O modules to be
installed in the base unit and the number of the modules.
Talker area length: total of data length of the input modules in use
Listener area length: total of data length of the output modules in use
For the number of words used by each of I/O modules, see Chapter 4.
(4) I/O module status information
The first 4 words of the talker area contain the status information of the I/O modules.
(a) Healthy counter
6F8C1120
Address
First word of the talker area Healthy counter (0000h to 0FFFh)
+1W I/O status-1
+2W I/O status-2
+3W Reserved
Figure 7-3 Information of the Head of the Talker Area
This counter indicates that the FL654 performs inputs and outputs normally.
When an input/output cycle is normally executed, one count is incremented.
Input/output cycles vary depending on the I/O module configuration, and one
count is incremented in 200 ms at worst.
Note that when the counter is incremented up to 0FFFh, it automatically returns
to 0000h.
7.2 Setting up the Talker and Listener Areas
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