67
Both serials support protocol modbus RTU as described below. Therefore
the PLC may be connected and may communicate with 2 master devices at
the same time.
Main features of protocol Modbus RTU
Baud-rate
9600 bits/sec (default)
Format
8,N,1 (8 bit, no parity, 1 stop) (default)
Supported
function
BITS READING
(0x01, 0x02)
WORDS READING (max 30 word)
(0x03, 0x04)
SINGLE BIT WRITING
(0x05)
SINGLE WORD WRITING
(0x06)
MULTIPLE BITS WRITING
(0x0F)
MULTIPLE WORDS WRITING (max 30 word) (0x10)
Error codes
ILLEGAL FUNCTION CODE
(0x01)
ILLEGAL DATA ADDRESS
(0x02)
ILLEGAL DATA VALUE
(0x04)
Broadcast
Simultaneus writing to all connected slaves using address
0x00 and no answer by slaves.
Polling
with
unknown slave
address
Polling using address 0xFF, any connected slave can
answer
1.9 Addresses word/bit of EPL101 for protocol Modbus
RTU
The following tables give all data (word and bit) which may be entered via
Modbus protocol. For all data the table gives reading/writing elements and
the value assumed at starting of PL250. According to initialization value at
styarting, the following options are given:
5. “ROM” fixed value defined by program.
6. “EEP” value stored on Eeprom for 10years even in absence of power
supply
7. “TAMP” value stored on Ram memory with buffer battery. These data
are stored in absence of power supply for a limited time (approx. 4
months)
8. “?” value of these data is unknown at starting
9. Defined value. The value assumed at starting is the value defined in
the table.
Summary of Contents for EPL101
Page 1: ...1 PLC P I X S Y S elettronica Manuale Installatore User Manual EPL101...
Page 81: ...81...
Page 82: ...82...
Page 83: ...83...