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6 Programless Communications

6 - 18

E5C-T Digital Controllers Programmable Type Communications Manual (H186)

Copying Procedure When Replacing a Controller

z Replacing a Slave (i.e., a Controller with a Communications Unit Number

Other Than 0)

(1) Replace the E5@C-T, wire it, and then turn ON the power supply.

(2) Change all of the E5@C-T Controllers to the initial setting level and stop programless

communications. The above step is not required for component communications.

(3) Set the Communications Unit No. parameter and Communications Baud Rate

parameter (57.6) in the new E5@C-T Controller and then return to the operation level.

(4) Copy the parameter set values from the master to the new E5@C-T Controller by

specifying the number of the Controller.

(5) Return all of the slaves and the master in order to the operation level. This completes

the replacement. The above step is not required for component communications.

z Replacing the Master (i.e., the Controller with a Communications Unit

Number of 0)

To copy the parameter settings, one of the slaves will function as the master, which means that the

No. 0 Upload Area and the No. 1 Upload Area will temporarily change in PLC memory. Turn OFF the

power supply to the PLC or otherwise make sure that the system will not be adversely affected

before you perform the following procedure.

(1) Perform steps 1 and 2 in the above procedure.

(2) Record the communications unit number and communications baud rate of the slave

with communications unit number 1, and then temporarily change the

communications unit number to 0 (master). Do not return to the operation level after

you change the communications unit number.

(3) Set the Communications Unit No. parameter and the Communications Baud Rate

parameter of the new E5@C-T to the values that you recorded, and then change to

the operation level.

(4) Copy the parameter settings from the temporary master, specifying the

communications unit number of the new E5@C-T.

(5) Reverse the communications unit numbers of the temporary master and the new

E5@C-T.

(6) Return all of the slaves and the master in order to the operation level. This completes

the replacement. The above step is not required for component communications.

Writing can be enabled and disabled from the PLC (or, for component communications, from the

E5@C-T master). The Communications Writing parameter is normally left ON (enabled). However, if it is

necessary to change set values from the display section of the E5@C-T in an emergency, temporarily

change the setting to OFF (disabled). If you disable communications when writing is being performed

from the PLC, an error will occur in the PLC. (An error code will be set in the Response Flag in PLC

memory.) If you cycle the power supply to the E5@C-T or move to the initial setting level and then go

back to the operation level, the Communications Writing parameter will automatically change to ON.

6-2-10 Communications Writing

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Unication E5 Spécifications Page 134