Instruction manual

3
1. 1 : 1 Connection 3-5
Serial Communications
-[Start Time]
Set a time delay in seconds in starting communications on the ZM-300 series to
avoid a delay in PLC processing that may occur when the ZM-300 series and the
PLC are turned on at the same time.
- Choose the action to be taken against communication errors.
[Comm. Error Handling]
Set error handling routine in the case that a communication error between the
ZM-300 series and the PLC occurs.
[Stop] If any communication error has arisen, the communications are
stopped. When restoring, use the Retry switch (found on the error
screen of the ZM-300 series).
[Continuous] If any communication error has arisen, it is indicated at the top left
corner on the ZM-300 screen. The ZM-300 series conducts
polling of the PLC, and if OK, the error state is automatically reset.
[Time-out Time] (0 to 999) (Unit: ×10 msec)
Specify a time for monitoring the receiving of a response from the PLC. If no
response is received within the specified time, a retrial is attempted.
[Retrials] (1 to 255)
Specify the number of retrial times. When the problem persists even after as
many retrials as specified, the system will start the error handling routine.
- [Text Processing]
(LSB → MSB / MSB → LSB)
When processing characters, choose
either option for arranging 1st/2nd
bytes in one word.
- [Code] (DEC/BCD)
Choose the code for entering numerical data. For some numerical data, such as
those for data displays or data sampling in the sampling mode, this setting is not
applied because BCD or DEC should be chosen for [Input Format].
- [Read Area] [Write Area]
Refer to the next section “System Memory.”
- [ Read/Write Area ZM-30 Compatible]
When converting screen data files created on ZM-30 into those of the ZM-300
series, this option is automatically checked. When this option is checked, ZM-30
compatibility is supported by securing 2 words each for [Read Area] and [Write
Area] in the same format as ZM-30. For more information, refer to the ZM-30 User’s
Manual.
- [ Use Ethernet]
When using Ethernet communications, check this option. For more information,
refer to “Chapter 4 Network Communications/1. Ethernet.”
Supplemental Information: Polling
“Polling” means to constantly monitor and check
the state of the other station.
[LSB → MSB]
MSB
LSB
15 0
2nd byte 1st byte
MSB LSB
15 0
1st byte 2nd byte
[MSB → LSB]