Mitsubishi Electric GT15, Connection Manual

Page: 711 / 864

21. MULTIPLE-GT14, GT12, GT11, GT10 CONNECTION FUNCTION
21.5 Precautions
21 - 11
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ROBOT CONT
ROLLER
CONN
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CNC CONNECTION
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ENER
GY M
EASU
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UNIT/ELEC
TRIC M
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MEA
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G IN
STRUM
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GOT
MUL
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DROP
CONNECTION
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M
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LT
IP
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-G
T1
4,
GT
12
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GT
11
, G
T10
CO
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MUL
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I-CHANNE
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F
A
TRANSP
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FUNCT
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21.5 Precautions

GOT's communication timing
(1) GOT's communication timing
Adjust the communication timing so that, after applying
the power to the system, the communication with the
connected device (MITSUBISHI ELECTRIC PLC) is
performed in order starting from the first GOT (from the
1st GOT to the 2nd, and so on).
When the communication is failed, retries are
performed. And if the predetermined time has elapsed,
a communication error occurs.
• If the first GOT is turned on after a while the second
GOT is turned on, because the communication start of
the second GOT is delayed, a communication error
may be detected at the second GOT.
• If the system power is turned on simultaneously and it
takes time to start the communication of the second
GOT, a communication error may be developed.
(2) Adjusting communication timing
(a) When powering up the system simultaneously
Using the utility or selecting [GOT Setup] -
[Opening Screen Time] from GT Designer3, set the
opening screen time adding a delay to each setting
for the GOTs.
During the opening process, communication with
the connected device does not start.
Example: Set value of [Opening Screen Time]
(Inside (): set value)
First module (5s) Second module (10s)
(b) When powering on devices individually
Turn on the connected device first, and then the
first GOT, the second GOT, and so on.

Using the FA transparent function
When multiple GOTs are connected, the FA transparent
function is not available even if the RS-232 interface or
USB interface is used for the connection.
(When connecting a personal computer to the first
GOT, the FA transparent function can be used.)

Monitoring stop condition for the GOT in the
multiple-GT11 connection
In the system where multiple GOTs are connected,
performing either of the following monitoring stop
operations on the preceding stage (the first GOT) also
stops monitoring of the GOT on the next stage (the
second GOT).
When the GOT on the preceding stage resumes
monitoring, the GOT on the next stage also resumes it.
• When project data or the OS is written/read by GT
Designer3
*1
• When the GOT is set up
*1
*1 A timeout error occurs in GX Developer.

When PLC power disconnection occurs in
the multiple-GOT connection
In the system where multiple GOTs are connected,
when the communication between the PLC and the first
GOT is stopped due to PLC power disconnection and a
disconnection of the communication cable between the
PLC and the first GOT, the GOT waits for timeout
against the communication request from the peripheral
devices (GX Developer, etc.), and recovery of
monitoring between the PLC and the GOT is delayed.
user screen
user screen
The title screen
is displayed.
Power supply (24V DC)
Power feeding to GOT
First GOT's
communication
Second GOT's
communication
Retry
Communication of the
2nd GOT is enabled.
PC
PC
1st GOT 2nd GOT
RS-232
PC
1st GOT
USB
GT Designer3
1st GOT 2nd GOT
USB
The project data is being download.
Monitoring
stopped
Downloading
1st GOT 2nd GOT
Monitoring Monitoring