GE-SNP communication driver

GE-SNP communication driver is the driver to communicate(loader port) with PLC of GE Fanuc Automation in U.S.A.

1. Read settings

<Figure 1> is read setting example of GE-SNP communication driver. 

<Figure 1>  Read setting example of GE-SNP communication driver

Device part of  <Figure 1> input Com Port(COM1), Baud Rate(19200), Parity Bit(1), Data Bit(8), Stop Bit(1) respectively according to setting of PLC.

GE-SNP communication driver read schedule

Read schedule setting parameters are as follows:

1) STATION – SNP protocol station number of PLC = 0 ~ 65535. ( you can use 0 SNP station number when communicating(serial) with a single PLC )

2) Read command – Memory type of PLC = R, AI, AQ, I, Q, T, M, SA, SB, SC, S, G.

3) Read start addresst – Read start address of PLC memory.

4) Save Start Address for Communication Server – saveing start address of Communication Server.

5) Read Size – Read size of word unit. Word unit memory area = 1 ~ 110, bit unit memory area = 1 ~ 220.

6) Data saving method - Data saving method when byte memory area, 0 = save readed data 'byte' unit,  1 = save readed data '10 bit' unit(arrange by 10 bit unit).

Note) GE-SNP communication driver support 0 ~ 65535(0h ~ FFFFh) SNP(CPUT) station number.

Read schedule example)

READ,   123h,     R,     0,    0,  50,

READ,   123h,     Q,     0,   50,  10,

READ,   123h,    AI,     0,   70,  10,

READ,   123h,    AQ,     0,   80,  10,

READ,   123h,     I,     0,   90,  10,

READ,   123h,     T,     0,  100,  10,

READ,   123h,     M,     0,  110,  10,

READ,   124h,    SA,     0,  120,   4,

READ,   123h,    SB,     0,  130,   4,

READ,   123h,    SC,     0,  140,   4,

READ,   123h,     S,     0,  150,   4,

READ,   123h,     G,     0,  160,  10,

READ,   124h,     R,    20,  200, 110,

READ,   124h,     M,    50,  310,  10,   1,   0,

<Table 1> is memory area and contents of GE PLC.

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

<Figure 2> Example of GE-SNP communication driver’s Option dialogue box

You can set read schedule by using , , button and listbox of <Figure 2>. 

<Figure 3> Example of GE-SNP communication driver’s read schedule Add/Edit dialogue box

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

2. Write settings

You can write memory value of PLC by using write settings.

Digital Write

Digital write setting parameters are as follows:

1)  PORT                   Port no. (0 ~ 255)

2)  STATION             SNP protocol station number of PLC = 0 ~ 65535. ( you can use 0 SNP station number when communicating(serial) with a single PLC )

3)  ADDRESS           Bit unit address in memory area.(decimal)

4) Extra1                    Write memory area = I, Q, T, M, SA, SB, SC, G. ( only bit unit memory )

5) Extra2                    Don't care.

Write example 1)

Port : 0  Station : 291  Address : 0001  Extra1 : Q, EXTRA2 :

The setting parameter shown above is bit write( ON/OFF ) example for 0001(1st) bit of Q memory area at 291 SNP station number.

Write example 2)

Port : 0  Station : 291  Address : 0021  Extra1 : M, EXTRA2 :

The setting parameter shown above is bit write( ON/OFF ) example for 0021(21th) bit of M memory area at 291 SNP station number.

Analog Write

Analog write setting parameters are as follows:

1)  PORT                   Port no. (0 ~ 255)

2)  STATION             SNP protocol station number of PLC = 0 ~ 65535. ( you can use 0 SNP station number when communicating(serial) with a single PLC )

3)  ADDRESS           Word/byte unit address in memory area.(decimal)

4) Extra1                    Write memory area = word unit memory area : R, AI, AQ,  byte unit memory area : I, Q, T, M, SA, SB, SC, G.

5) Extra2                    Don't care.

Write example 1)

Port : 0  Station : 291  Address : 0007  Extra1 : AQ, EXTRA2 :

The setting parameter shown above is word unit analog write example for 0007(7th) word of AQ memory area at 291 SNP station number.

Write example 2)

Port : 0  Station : 291  Address : 0123  Extra1 : R, EXTRA2 :

The setting parameter shown above is word unit analog write example for 0123(123th) word of R memory area at 291 SNP station number.

Write example 3)

Port : 0  Station : 291  Address : 0012  Extra1 : M, EXTRA2 :

The setting parameter shown above is byte unit analog write example for 0012(12th) byte of M memory area at 291 SNP station number.

3. connection of communication when Versa Max model

Connection of communication cable when Varsa Max GE PLC model are as follows.

Connection of RS-232C communication cable

Please connect normal RS-232C serial communication cable to 9pin connector such as <Figure 4>.

Connection of RS-422/485 communication cable

Please connect 10 ( Rx- ), 11 ( Rx+ ), 12 ( Tx- ), 13 ( Tx+ ) of 15 pin RS-422/485 connector and Tx-, Tx+, Rx-, Rx+ connector of computer respectively. ( Refer to <Figure 4> )

15 pin connector of VersaMax GE PLC            computer( RS-485 )

 10 pin( Rx-)  ----------------------------  Tx-

11 pin( Rx+)  ----------------------------  Tx+

12 pin( Tx-)  ----------------------------  Rx-

13 pin( Tx+)  ----------------------------  Rx+

<Figure 4> Connection example of communication cable and main power to Versa Max model og GE PLC

4. Setting of SNP station number

 SNP station number(ID) can set by using Versa Pro program of GE Fanuc Automation.

Setting method of SNP station number are as follows.

 1) Run Versa Pro ladder program and open project or create new project.

 2) Please select(double click of mouse left button) 'Hardware Configuration' of Folder Browser window.

   Then open 'HWC setting window' such as <Figure 5>.

3) When you select ‘Edit|Rack Operations|Configure CPU Parameters’ at  HWC setting window(<Figure 5>).

   Then will be opened 'CPU Parameters setting window' such as <Figure 6>.

4) Please select 'Port1( RS-232C )' or 'Port2( RS-485 )' tap at <Figure 6>. 

5) Click 'SNP ID' and select(double click of mouse left button) this menu.

   Then will be opened 'SNP ID input dialog' such as <Figure 7>.

6) Input SNP ID(station number) at <Figure 7> dialog.

   SNP ID input range = max 6 ~ 7 digit hexadecimal unit.

   But available SNP ID for GE-SNP communication driver = 0h ~ FFFFh(4 digit, 65535).

7) Download(store) th Hardware Configuration data to PLC by using Versa Pro Ladder program.

<Figure 5> Example of HWC window

<Figure 6> Example of CPU Parameter setting window

<Figure 7> Example of SNP ID input dialog