三菱PLC通讯手册.pdf

文档介绍：: .
三菱工控产品北京分销中心
奇偶: even
校验: 累加方式 和校验
字符: ASCII
16 进制代码
ENQ 05H 请求
ACK 06H PLC 正确响应
NAK 15H PLC 错误响应
STX 02H 报文开始
ETX 03H 报文结束

帧格式

STX CMD DATA ...... DATA ETX SUM(upper) SUM(lower)
例子
STX ,CMD ,ADDRESS, BYTES, ETX, SUM
02H, 30H, 31H,30H,46H,36H, 30H,34H, 03H, 37H,34H
SUM=CMD+......+ETX
30h+31h+30h+46h+36h+30h+34h+03h=74h;
累加和超过两位取低两位
三菱 FX 系列 PLC 编程口通信协议举例



三菱 FX 系列 PLC 编程口通信源代码


#define DELAY_TIMES 30000L
#define TRUE 1
#define FALSE 0
#define TRUE 1
#define FALSE 0
#define FORCE ON 0x37
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#define FORCE_OFF 0x38
void init_plc(void);
int check_plc(void);
int _read_data_register(unsigned int uAddress,unsigned int number);
int _read_mdata_register(unsigned int uAddress,unsigned int number);
int _write_data_register(unsigned int uAddress,unsigned int number);
int _force_m_contact(unsigned int uAddress,unsigned char ucOn_off);
int read_data_register(unsigned int uAddress,unsigned int number);
int read_mdata_register(unsigned int uAddress,unsigned int number);
int write_data_register(unsigned int uAddress,unsigned int number);
int force_m_contact(unsigned int uAddress,unsigned char ucOn_off);
int _read_m_register(unsigned int uAddress,unsigned int number);
int read_m_register(unsigned int uAddress,unsigned int