Serial Interface Configuration, SNP T1 T4 Timers

Configuration

Mode#2 – Mode#2 is used to connect a SNP master to the network using a VMSE. An example of this is:

A Series 90 PLC with a serial port set up for SNP where COMMREQs are used to communication with other PLCs.

Serial Interface Configuration

Enter the interface setup as BBBB,D,P,S where BBBB is the baud rate ( default is 19200, D is the number of data bits (must be 8), P is parity (SNP defaults to O, the letter “O” not zero, S number of stop bits ( must be 1).

The Default setting is the same as GE Fanuc PLC defaults; 19200 Baud, 8 data bits, Odd parity, and 1 stop bit.

SNP T1 – T4 Timers

T1 – Turn-Around Delay

T2 – ACK/NAK Timeout

T3 – Link Idle Timeout

T4 – After Break Delay

SNP ID to IP Address Mapping ( only for SRTP/SNP Mode#2)

This setting is used only when VMSE configuration Mode#2 is used. This setting directs messages to the VMSE which has the IP address that corresponds to the SNP address in this mapping table. Up to four SNP IDs to IP addresses can be entered. Wildcards are to be used to allow multiple SNP IDs for communicate to PLCs multidropped off of one VMSE. An example would be to enter:

SNP ID “A* ”

IP Address 3.0.0.1

The SNP IDs “A1”, “AA”, and APPLE would all go the VMSE with the IP address 3.0.0.1 The PLCs with the correct SNP ID would respond to the SNP message

GFK-1852

Chapter 4 Configuration

4-7

GFK-1852 specifications

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