Samsung Ht As700 User Manual
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101 Specialty Module Dimensions NX-IOLINK Module Dimensions 115 .5 35.0 RS232C COM1 RS485 RS232C COM2 RS485RESET 104 .0 AU I T 12V 35.035.0 LINK NO00 0 FG - + + - F.G NX-MWLINKMW LINKNX-SC USCUNX-ETHER N ETEtherN et unit (mm) + - FG LINE 4 3 2 1 OFF ON MODE SW 24V D C INPUT+ -105.0 70.5 unit (mm)
102 Decimal, Bin, Hex, BCD, Gray Code Cross-reference Table
103
ASCII Code Table
b4b3b2b101234567
00000NULDEL0@P`p
00011SO HDC1!1AQaq
00102ST XDC2“2BRbr
00113ETXDC3#3CScs
01004EO TDC4$4DTdt
01015ENQNAK%5EUeu
01106ACKSYN&6FVfv
01117BELETB'7GWgw
10008BSCA N(8HXhx
10019HTEM)9IYiy
1010ALFSUB*:JZjz
1011BVTESC+;K〔k{
1100CFFFS‘N∧n~
1111FSIUS/?O_oDEL
b8b7b6b5
b8
b700001111
b600110011
b501010101
C
R
SPA CE
105 Appendix Communication Protocols The communication protocol of NX-CPU700p PLC provides a complete method of communications between the graphic consol programmers (WinGPC) and the PLC by controlling programs, CPU status, and I/O at user’s convenience. The user can easily expand the capabilities of the overall PLC system by communicating to the PLC using a variety of peripheral communications equipment in accordance with the following communication protocols and procedures. Additionally, the communications protocol allows for the PLCs to communicate to a central computer on a single network using RS485, at a distance of up to 1.2 km (RS232C, 15 m). Communication Protocols for NX-CPU700p Half duplex asynchronous Parity: No parity Stop bit: 1 stop bit Communication method: RS232 or RS485 (optional) Communication speed: 4800/9600/19200/38400 bps (optional) Communication cable: refer to the cable wiring diagram Number of PLCs on a single network: Maximum of 64 (communicating 1:N using RS485) Maximum communication delay time: 3 seconds Communication environment
106 Communication Protocols Q (Query) is a signal sent from the peripheral devices to the PLC after setting the network ID number and the function code for the PLC to communicate with. QA (Query Acknowledge) is a signal sent from the PLC to the peripheral devices, indicating that the Q signal from the peripheral device was received. RR (Response Request) is a signal sent from the peripheral device to the PLC, indicating that the QA signal from the PLC was received. This signal is sent when Q →QA is normal. When the PLC receives the RR from the peripheral device, it determines that the communication with peripherals is successful and sends R (Response) signal to the peripherals. This R signal contains how the original Q signal from the peripheral device handled its function code. The communication cycle for one function code ends when the PLC sends the R. Communications delay The PLC will return a signal after receiving a Q or an RR within a specific time. However, due to errors in the communications network, CRC values, and communication speed flux, there are occasions when the PLC will not receive the signal from the peripheral device. The peripheral device should allow up to three seconds for a response from the PLC. If there are no responses to the Q or the RR message, the communication is considered to have failed, and the Q or RR should be sent again. CPU ID All devices connected to the network need a network ID number for communication. There is an available range of 0 to 191 network ID numbers for the NX series. Redundancy is not permitted. When a single PLC and a peripheral device are connected, usually 0, 1, or 255 is assigned as the network ID number to the PLC. When the peripheral device wants to communicate to a connected PLC regardless of its programmed network ID number, it can use global network ID number 255, to which any PLC will respond. However, the NX series can not be used to communicate with more than two CPU modules at one time, so if you assign ID 225 as an ID of more than two CPU modules at once, it will cause communication errors. Step 2-QA Step 1-Q Step 3-RR Step 4-R Query Query Query Query Acknowledge Query Response Query Response Request
107 When several CPU modules are connected to one communication network, they must use individual ID numbers. The PLC’s network ID number is configured using the WinGPC. Communication steps The NX CPU can support 2-step or 4-step communication methods. The communication methods are easily distinguished each other by selecting and sending the function code of the Q frame. Even for the 4- step method, the 2-step method can be used for the repeated function. This function sends and receives the only RR repeatedly when you want to redo the frame you sent with query, allowing users to quickly monitor data. 2-step communication method This method allows users to easily and directly program communication since it only uses the simple Q →R steps. 2-step configuration: Q(step 1) → R(step 2) Repeated function code: Q(step 1) →R(step 2)→RR(step 1) →R(step 2) → RR(step 1) → R(step 2).... 4-step communication method Q → QA → RR → R. 2-step method can be used for the response to the repeated function code. 4-step configuration: Q(step 1) →QA(step 2)→RR(step 3)→R(step 4) Repeated function code: Q(step 1) →QA(step 2)→RR(step 3)→R(step 4)→ RR(step 1) →R(step 2)…
108 2-step communication method 4-step communication method No communication error Peripheral device PLC Peripheral device PLC Peripheral device PLC When R is not received Response to repeated function code 3 seconds No communication error Peripheral device PLC Peripheral device PLC Peripheral device PLC When QA is not received Peripheral device PLC When R is not received Response to repeated function code3 secondsFor the internal processing of the PLC CPU send RR at least 5 msec after receiving QA. 3 seconds
109 Function codes included in the query Each function code is 1 byte. When the PLC receives a query (Q), the function code of the final response (R) is formed by adding $80 (hex) to the function code sent by the query. The value added to the function code sent by the query differs for 2-step and 4-step by $20 (hex). The function code of the R message can be used by the peripheral device to verify that the correct Q message has been received by the PLC. Communication function codes $ notes hexadecimal notations The bit/word address assignment uses the absolute address method for reading memory locations. (Refer to Absolute Addressing on Chapter 3) Please contact our technical support for more information about reading/writing program or other function codes. Query, which dictionary meaning is `question’, `ask’, or `question mark’, means that a user or an application program requests any specific information to a corresponding part when it is used as a communication term. Communication functionQuery (Q) function codeResponse (R) function code Remarks 2-step4-step2-step4-step Read bits $21 $01 $A1 $81 Detailed description Write bits $22 $02 $A2 $82 “ Read words $23 $03 $A3 $83 “ Write words $24 $04 $A4 $84 “ Read bits and words $25 $05 $A5 $85 “ Write bits and words $26 $06 $A6 $86 “ Read program $27 $07 $A7 $87 No detailed description Write program $28 $08 $A8 $88 “ Read instruction $29 $09 $A9 $89 “ Change instruction $2A $0A $AA $8A “ Change operand $2B $0B $AB $8B “ Insert instruction $2C $0C $AC $8C “ Delete instruction $2D $0D $AD $8D “ Search instruction $2E $0E $AE $8E “ Search operand $2F $0F $AF $8F “ Delete all/parts of program $20 $10 $A0 $90 “ No service $00 $00 $00 (hex) $00 (hex) “
110
Cyclic Redundancy Checking (CRC)
The CRC is a 2-byte checksum code attached to the end of the message
by the sender to check if the communication frame is transmitted
without error.
The sender calculates the CRC when it sends one-byte message, and
the receiver should also calculate the CRC from the data of the
message. Since this CRC calculation takes a long time when writing a
communication program, you should find any ways to increase the
speed of this part to avoid errors and improve the communication
speed.
CRC-16 calculation subroutine written in BASIC
CRC_Sum: CRC-16 reserve code after the calculation (CRC content to be sent at the
end of message)
Data: CRC-16 data input to be calculated (byte data from message)
1000 CRC_Sum = CRC_Sum XOR Data
1010 FOR I=1 to 8
1020 CARRY=CRC_Sum AND 1
1030 RC_Sum=CRC_Sum SHR 1
1040 IF CARRY=1 THEN CRC_Sum XOR 0A001H
1050 NEXT I
1060 RETURN
CRC-16 calculation subroutine written in PASCAL
Procedure CRC16 (Data: Byte)
Var i : Byte;
Begin
CRC_Sum := CRC_Sum xor Data;
for i : 1 to 8 do
Begin
if((CRC_Sum and 1)=1) then CRC_Sum := (CRC_Sum shr 1) xor $A001;
Else CRC_Sum: = CRC_Sum shr 1;
End;
End;
CRC-16 calculation subroutine written in C
Void Crc16 (unsigned int Data) {
Unsigned int i;
Crc=Crc^(Data & 0x00FF);
for(i=0;i>1)^0xA001;
else Crc=Crc>>1;
}
}
CRC calculation range
DA SA Function Length Information CRC L CRC H
CRC calculation range2 bytes