SIEMENS S7-200 PPI Communication Driver

SIEMENS S7-200 PPI is driver to communicate with PLC S7-200 model of SIEMENS Corp., in Germany.

1. Read settings

<Figure 1> is read setting example of SIEMENS S7-200 PPI communication driver.

<Figure 1> Read setting example of SIEMENS S7-200 PPI driver

Device part of <Figure 1> input Com Port(COM1), Com Baud(9600), Parity Bit(2), Data Bit(8), Stop Bit(1) respectively, according to device.

Also, you can enter the Address of Computer(0 ~ 126, Default = 0), Result of WORD address(0 ~ 9999, Default = 500) which comparing with PLC memory data, Whether to use Read/Write address as BYTE unit ( 0 = Don't care, 1 = Use as BYTE unit, Default = 1 ), Whether to save read data as BYTE unit( 0 = Not use, 1 = Save as BYTE unit, Default = 0 ), Protocol Type(0 = Normal, 1 = New Type, 2 = Extended Code, Default = 0) and Read delay time after writing(0 ~ 1000mSec, Default = 0) at Option part by classifying as comma( , ).

Notice) You can set Com Baud of PPI protocol for S7-200 PLC as 9600, 19200 and etc(by using STEP 7-Micro/Win program), and Parity Bit, Data Bit and Stop Bit are fixed as 2, 8 and 1.

SIEMENS_S7-200 PPI communication driver's read schedule

Read schedule setting parameters are as follows:

1) STATION – PLC address number between 0 and 126.

2) Read Data Type – Input among V.y, M.y, I.y, Q.y, SM.y, S.y, C, T, AI and AQ. ( Refer to <Table 1> )

y = Read data type among Blank, B, W, D and F

( B : BYTE, W or blank, etc : WORD, D : DWORD, F : FLOAT )

3) Read Start Address – Start address to read in designated memory.

In case of using Read/Write address as BYTE unit( set at Option ) – Always BYTE unit address,

In case of not using Read/Write address as BYTE unit( set at Option ) - BYTE/WORD/DWORD/FLOAT unit number,

But, T, C, AI and AQ area always use WORD unit.

4) Save Start Address for Communication Server - Saving start address of Communication Server.

5) Read Size - The number of BYTE/WORD/DWORD/FLOAT to read.

(It is possible to read maximum 222 BYTE/111 WORD/55 DWORD/55 FLOAT. There is difference according to model)

Read schedule example)

READ	STATION	Read Data Type	Read Start Address	Save Start Address for Communication Server	Read Size
READ	2	V.W	0	0	50
READ	2	V.W	500	50	100
DWORD	2	V.D	100	0	10
FLOAT	2	V.F	200	0	10
READ	2	M.W	0	200	16

Memory Area	Contents	Remarks
V	Data Block
M	Memory Area
I	Input Area
Q	Output Area
SM	SM Area
S	S Area
C	Count Area	Word Only Memory
T	Timer Area
AI	AI Memory
AQ	AO Memory
<Table 1> Memory area type and contents of Siemens S7-200 PPI communication driver

If you click the icon in protocol option part of <Figure 1>, you can see the dialog box such as <Figure 2>. You can also set read schedule by using this part.

<Figure 2> Example of SIEMENS S7-200 PPI driver's Option dialog box

Also, you can enter Computer address, Result of WORD address for comparing with PLC memory data, Whether to use Read/Write address as BYTE unit, Whether to save read data as BYTE unit, Whether to use new Write Protocol and Reading delay time after writing, at Source Addr, Multi Write Check Status Address, Byte Unit R/W Addressing, Byte Unit Save Addressing, Protocol Type and Write After Sleep Time area of <Figure 2>.

You can set read schedule by using , , button and listbox of <Figure 3>.

<Figure 3> Example of SIEMENS S7-200 PPI driver's read schedule Add/Edit dialog box

When you click Add button or Edit button in dialog box of <Figure 2>, dialog box of <Figure 3> is shown.

2. Writing settings

You can change PLC memory as set value by using writing settings.

Digital Write

Digital write setting parameters are as follows :

1) Port Connected port number. (Not COM number)

2) Station Input PLC address between 0 and 126.

3) Address 0000 ~ xxxF,

High 3 digits are output address of BYTE unit as decimal unit

( But, in case of not using Read/Write address as BYTE unit, it is output address of BYTE/WORD/DWORD/FLOAT unit )

Sub 1 digit is bit position between no.0 and no.F.

4) Extra1 Input among V.y, M.y, I.y and Q.y.

y = Data type to read among Blank, B, W, D and F

( B : BYTE, W or Blank, etc : WORD, D : DWORD, F : FLOAT )

5) Extra2 In case of DWORD/FLOAT output, designate 0 ~ 15 bit and 16 ~ 32 bit

0 : Bit between no.0 and no.15( 00h ~ 0Fh ),

1 : Bit between no.16 and no.31( 10h ~ 1Fh ).

Writing example 1)

Port : 0 Station : 0 Address : 0127, Extra1 : V.B, Extra2 : Blank

If you set as above and write digital value, you can ON/OFF the 8th (no.7) bit value of V memory's no.12 BYTE.

Writing example 2)

Port : 0 Station : 0 Address : 006F, Extra1 : V.W, Extra2 : Blank

If you set as above and write digital value, you can ON/OFF the 16th(no.F) bit value of V memory's no.6 BYTE(but, in case of not using Read/Write address as BYTE unit, it is no.6 WORD).

Writing example 3)

Port : 0 Station : 0 Address : 0160, Extra1 : V.W, Extra2 : Blank

If you set as above and write digital value, you can ON/OFF the first (no.0) bit value of V memory's no.16 BYTE(but, in case of not using Read/Write address as BYTE unit. it is no.16 WORD).

Writing example 4)

Port : 0 Station : 0 Address : 0069, Extra1 : V.D, Extra2 : 0

If you set as above and write digital value, you can ON/OFF the 10th(no.9) bit value of V memory's no.6 WORD(but, in case of not using Read/Write address as BYTE unit, it is no.6 DWORD).

Writing example 5)

Port : 0 Station : 0 Address : 004F, Extra1 : M, Extra2 : Blank

If you set as above and write digital value, you can ON/OFF no.F bit value of M memory's no.4 byte(but, in case of not using Read/Write address as BYTE unit, it is no.6 WORD).

Reference) SM, S, C, T, AI, AQ memory of S7-200 PLC not support the bit write.

Analog Write

Analog write setting parameters are as follows:

1) Port Connected port number. (Not COM number)

2) Station Input PLC address between 0 and 126.

3) Address Output address of BYTE unit as decimal number

( But, in case of not using Read/Write address as BYTE unit, it is output address of BYTE/WORD/DWORD/FLOAT unit )

4) Extra1 Input among V.y, M.y, I.y, Q.y, SM.y, S.y, C, T, AI and AQ. ( Refer to <Table 1> )

y = Data type to read among blank, B, W, D and F

( B : BYTE, W or blank, etc : WORD, D : DWORD, F : FLOAT )

5) Extra2 Setting for writing/comparing Multi-analog value

1 = Save multi-write value, ( Don't care about Extar1 area )

2 = Write multi-write value as current saved value, ( Continuous output as much as the number of saved from current set address )

3 = Delete all contents which are saved by multi-write value, ( Don't care about Extar1 area )

4 = Compare PLC memory address value with current saved value, ( Continuous comparison as much as the number of saved from current set address )

Result of comparison is saved at designated WORD address of result of comparison. If comparison value is equal = 1, If comparison value is different = 0

Etc value( If value is larger than 0 or 4 ) = General( single ) analog value writing

Writing example 1)

Port : 0 Station : 0 Address : 0011, Extra1 : V.B, Extra2 : Blank

If you set as above and write analog value, you can change no.11 BYTE area of V memory as designated value(between 0 and 255).

Writing example 2)

Port : 0 Station : 0 Address : 0152, Extra1 : V.W, Extra2 : Blank

If you set as above and write analog value, you can change no.152 BYTE area(but, in case of not using Read/Write address as BYTE unit, it is no.152 WORD) of V memory as designated value(between 0 and 65535).

Writing example 3)

Port : 0 Station : 0 Address : 0035, Extra1 : V.D, Extra2 : Blank

If you set as above and write analog value, you can change no.35 BYTE area(but, in case of not using Read/Write address as BYTE unit, it is no.35 DWORD) of V memory as designated value(in range of DWORD data).

Writing example 4)

Port : 0 Station : 0 Address : 0176, Extra1 : V.F, Extra2 : Blank

If you set as above and write analog value, you can change no.176 BYTE area(but, in case of not using Read/Write address as BYTE unit, it is no.176 FLOAT) of V memory as designated value.

Writing example 5)

Port : 0 Station : 0 Address : 0016, Extra1 : M, Extra2 : Blank

If you set as above and write analog value, you can change no.16 BYTE area(but, in case of not using Read/Write address as BYTE unit, it is no.16 WORD) of M memory as designated value.

Reference) SM, S, C, T memory area of S7-200 PLC not support WORD unit write.

Example of writing script for Multi-Word writing settings)

$AO_0000.Extra2 = 3; // Delete previous saved multi-write value

@SetTagValue("AO_0000", 0);

$AO_0000.Extra2 = 1; // Set as saving multi-write value

for(i = 0; i < 105; i = i + 1) {

@sprintf($AO_0000.Extra1, "%03d", i); // Set as lest it ignore the same data by entering random value to Extra1

@SetTagValue("AO_0000", 5000); // Save real output value, random storage as 5000, in here

}

@sprintf($AO_0000.Extra1, "V.W"); // Memory designation, Set the memory type and unit of B ( Byte ), W ( Word ), D ( Dword ), F ( Float )

$AO_0000.Extra2 = 2; // Designate multi-value write

@SetTagValue("AO_0000", 1); // Write value, Output the 105 values from designated address

Example of writing script for confirming whether memory value and current value of PLC are same or not)

$AO_CHECK_MEM_SET = 2; // Set WORD address as 2, for confirming comparison completion

for(i = 0; i < 1; ) {

if($AI_CHECK_WRITE_STATUS == 2) i = 10; // Writing value of 2 is completed

@TagCheckLoop(); // Function for confirming tag value change

}

$AO_0000.Extra2 = 3; // Delete the previous saved data value

@SetTagValue("AO_0000", 0);

$AO_0000.Extra2 = 1; // Set as saving data value

for(i = 0; i < 105; i = i + 1) {

@sprintf($AO_0000.Extra1, "%03d", i); // Set as lest it ignore the same data by entering random value to Extra1

@SetTagValue("AO_0000", 5000); // Save real output value, random storage as 5000, in here

}

@sprintf($AO_0000.Extra1, "V.W"); // Memory designation, Set the memory type and unit of B ( Byte ), W ( Word ), D ( Dword ), F ( Float )

$AO_0000.Extra2 = 4; // Designate comparison of data value

@SetTagValue("AO_0000", 1); // Command for comparing data as much as input from designated address

for(i = 0; i < 1; ) {

if($AI_CHECK_WRITE_STATUS == 1) i = 10; // Compared result 1 = Same data

if($AI_CHECK_WRITE_STATUS == 0) { // Compared result 0 = Other data exists

@MessageBox("Contents of compared data are different each other.", "Data compared Error", MB_OK);

return;

}

@TagCheckLoop(); // Function for confirming tag value change

}

@MessageBox("Contents of compared data are same.", "Data compared Completion", MB_OK);

Note when you create a script for comparison)

1) Save result of comparison to WORD memory address which is set at Option part as 1 ( same data ) or 0 ( different data ).

2) Confirm result of comparison by first entering value except 1 and 0(value of 2, at example) to WORD address which is set before comparing PLC and memory.

3) Set the AO_CHECK_MEM_SET analog output tag so that write forcedly to WORD address which is set at Option part. ( Extra1 = Set as #MEM# )

4) Attune AI_CHECK_WRITE_STATUS analog input tag to WORD address which is set as PLC_SCAN tag.

3. Communication cable connection

Connect communication cable to SIEMENS S7-200 PLC, as follows.

RS-232C communication cable connection

Connect general RS-232C(Cross) cable to RS-232C terminal of SIEMENS S7-200 PLC such as <Figure 4>.

<Figure 4> is appearance of connecting RS-232C communication cable to SIEMENS S7-200 PLC.

<Figure 4> Appearance of connecting RS-232C communication cable to SIEMENS S7-200 PLC