Mitsubishi-electric QJ71C24N Manuel d'utilisateur télécharger pdf (Page 107)

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MELSEC-Q

4 SETTINGS AND PROCEDURES PRIOR TO OPERATION

(2) Restart the PLC CPU station or reset the CPU. The test starts automatically in

about one second.

(3) For the Q series C24, the following tests should be performed once.

1) ROM check

Read the ROM data and verify the sum check.

2) RAM check

Write data to RAM, and read and check it.

3) Switch check

Check whether or not each switch is set within the tolerance range and the

operation setting in the transmission settings is set to off.

4) Linked operation setting check (perform this test with the operation setting in

the transmission settings of CH2 set to on)

Check to see that the communication protocol setting on CH1 is set to 8

and

whether the communication rate setting of each channel is within the tolerance

range.

A linked operation setting check is performed when values are set as follows:

• Communication protocol setting on the CH1 side

: 8

• Operation setting in the transmission settings on the CH2 side: bit 8 = ON.

(Procedure 3) Checking results of ROM/RAM/switch tests

(1) The test is completed when the NEU LED on CH1 side is lit (approximately 2

seconds).

(2) The test is completed normally when the ERR LED turns off.

(3) The test is completed with error when the ERR LED turns on. Check the error

description in one of the following screens.

• The "Monitor/test others" screen of GX Configurator-SC (see Section 8.6.9)

• The buffer memory monitor screen of GX Developer (see the GX Developer

Manual for the operation method)

When checking errors in the buffer memory monitor screen of GX Developer,

monitor the following buffer memory.

Check the error descriptions on the screens by bit-decoding the monitored value

(16-bit integer). Each bit corresponds to the following error description.

Buffer memory monitored

Address

Bit location

CH1 side

201H

CH2 side

202

CH1/CH2 side

203

Description when corresponding bit is on Corrective action

b0 — — —

b1 SIO — Transmission setting error

b2 PRO —

When linked operation

setting

Protocol setting error

b3 P/S — Transmission setting error

b4 C/N —

When independent

operation setting

Protocol setting error

Review setting value

(see Section 4.5.2)

b5 to b6 — — — —

b7 NEU — Test completed —

b8 to b13 — — —

CH2 ERR — RAM error ( 1)

b14

—

Setting station

number

Out of the setting station number range

Review setting value

(see Section 4.5.2)

b15

—

CH1 ERR — ROM error ( 1)

1 Consult your nearest dealer.

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Mitsubishi-electric QJ71C24N Manuel d'utilisateur Page 107

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