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161
Appendix A
Symptom: Cannot Communicate or a Communications Error
Occurs
Meaning
Countermeasures
The communications wiring is not correct.
Correct the wiring.
The communications line has become dis-
connected
Correct the communications line securely and tighten the screws.
The communications cable is broken.
Replace the cable.
The communications cable is too long.
The total cable length is 500 m maximum for RS-485 and 15 m maximum for
RS-232C communications.To extend the communications distance for RS-
232C communications, use OMRON's
Z3R
Optical Interface.
The wrong communications cable has
been used.
Use a shielded, twisted-pair AWG24 to AWG14(cross-sectional area of
0.205 to 2.081 mm
2
)cable for the communications cable.
More than the specified number of commu-
nications devices are connected to the
same communications path for RS-485
communications.
When 1:N RS-485 communications are used, a maximum of 32
nodes(including the host node) can be connected.
An end node has not been set at each end
of the communications line for RS-485
communications.
Set or connect terminating resistance at each end of the line. If the E5CZ,
E5AZ,or E5EZ is the end node, use 120-
Ω
(1/2-W) terminating resistance.
The combined terminating resistance with the host device must be at least
54
Ω
The specified power supply voltage is not
being supplied to the Controller.
Supply the specified power supply voltage.
The specified power supply voltage is not
being supplied to an Interface Converter
(such as the K3SC) .
Supply the specified power supply voltage.
The same baud rate and communications
method are not being used by all of the
Controllers, host devices, and other
devices on the same communications line.
Set the same values for the baud rate, protocol, data length, stop bits, and
parity on all nodes.
The unit number specified in the command
frame is different from the unit number set
by the Controller.
Use the same unit number.
The same unit number as the Controller is
being used for another node on the same
communications line for RS-485 communi-
cations.
Set each unit number for only one node.
There is a mistake in programming the
host device.
Use a line monitor to check the commands. Check operation using a sample
program.
The host device is detecting the absence
of a response as an error before it receives
the response from the Controller.
Shorten the send data wait time in the Controller or increase the response
wait time in the host device.
The host device is detecting the absence
of a response as an error after broadcast-
ing a command(except for SYSWAY).
The Controller does not return responses for broadcast commands.
The host device sent another command
before receiving a response from the Con-
troller.
The response must always be read after sending a command (except for
broadcast commands).
The host device sent the next command
too soon after receiving a response from
the Controller.
After receiving a response, wait at least 2 ms before sending the next com-
mand.
Содержание E5AZ
Страница 2: ...E5CZ E5CZ U E5AZ E5EZ Digital Temperature Controller User s Manual Produced September 2008 ...
Страница 3: ...iv ...
Страница 23: ...xxiv ...
Страница 53: ...30 Using the Support Software Port Section 2 3 ...
Страница 79: ...56 Using HB and HS Alarms Section 3 10 ...
Страница 115: ...92 Output Adjustment Functions Section 4 14 ...
Страница 173: ...150 Communications Setting Level Section 5 8 ...
Страница 205: ...182 Index precautions 22 terminal arrangement 21 terminals 21 ...