CHAPTER 13 RS-485 COMMUNICATIONS

5. Communications example

5-1. Immediate value data operation

A Communications example for conducting positioning operation with immediate value data is

described.

 Preparation

 Select the positioning operation control mode.

･･･ PA1_01: Control mode selection

 Assign [START] to CONT9.･･･ PA3_09: CONT9 signal assignment

 Assign [INP] to OUT6. ･･･ PA3_56: OUT6 signal assignment

=7: Positioning operation

=4: [START]

=2: [INP]

 Communications example

 Turn on [S-ON] assigned to CONT1 to arrange the operation state, and perform communications

as shown below.

 The example assumes a communications baud rate of 38400 bps.

5 ms

①

②

③

④

⑤

⑥

⑦

⑧

Query

Response

[START]

[INP]

Immediate value data setting 1 Immediate value data setting 2

OFF

Speed

Immediate value data

operation 1

Immediate value data

operation 2

(1) Write immediate value data setting 1 as immediate value data.

Setting 1: Designation method = ABS. Immediate value position = 500000 units.

Immediate value speed = 500.00 r/min

Query: 01 10 5100 0006 0C 00000000 0007A120 0000C350 D9EC (21 bytes)

Response: 01 10 5100 0006 50F7 (8 bytes)

(2) Write “1” (ON) to [START] to start positioning operation. (Immediate value data operation 1

based on immediate value data setting 1 starts.)

Query: 01 10 0000 0002 04 00000001 326F (13 bytes)

Response: 01 10 0000 0002 41C8 (8 bytes)

The detail timing at this time is shown below.

Query

5 ms

Detection of time for 3

characters (38400 bps)

1.5 ms

Response

[START]

0.5 ms

Speed

0.5 ms

13-36 Modbus RTU Communications