Eaton ELC-PB, Programming Manual

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E L C P r o g r a m m i n g M a n u a l
F o r m o r e i nf o r m a t i o n v i sit :
w w w. e a t o n . c o m
MN05003003E
3-224
Program Example 4: COM3 RS-485
1. Only the 8-bit mode is supported (ELC sets M1161 = ON automatically)
2. STX/ETX function (M1126/M1130/D1124~D1126) is not supported.
3. The high byte of the 16-bit data is not available. Only the low byte is valid for data
communications.
4. Enter the data to be transmitted into registers starting with D100 then set M1316 (COM3
sending request) to ON
5. When X10 = ON, the RS instruction executes and the ELC is ready for communications. 4
bytes of data beginning with D100 will be sent. Each time the data has been sent, M1318 will
be automatically reset. (DO NOT reset M1318 in the program). After approximate 1ms, the
ELC will start to receive 7 data bytes and store them in 7 consecutive registers starting from
D120.
6. When the data received is complete, M1318 will automatically be ON. When the received data
is completed, M1318 must be reset (OFF) and the ELC will be ready for communications
again.
Receiving completed and flag reset
Setting communication protocol as 9600,8,E,1
Retain communication protocol
Set up communication time out as 100ms
M1002
MOV H87 D1120
SET M1136
MOV K100 D1252
X0
RS
D100 K4 D120 K7
M1318
Processing received data
RST M1318
Pulse for
sending request
Pulse
Write transmitting data in advance
Sending request SET M1316
Sending data: (ELC
→
External equipment)
D100L D101L D102L D103L
Source data register, starting from
lower 8 bits of D100
Length = 4