IEC60870 Slave handles the 'Reset process' command correctly but responds to a master with PN-bit (negative confirmation)

IEC60870 Slave handles the 'Reset process' command correctly but responds to a master with PN-bit (negative confirmation)

Summary

Issue when a master sends to IEC60870 Slave (zenon Process Gateway or I/O driver in Logic) the 'Reset process' command - C_RP_NA_1 (T105) with COT=6 (activation):

the Slave transfers to the Runtime the received value of QRP correctly, but it responds in activation confirmation (COT=7) with P/N bit set - so negative.

Description

Issue when a master sends to IEC60870 Slave (zenon Process Gateway or I/O driver in Logic) the 'Reset process' command - C_RP_NA_1 (T105) with COT=6 (activation):

the Slave transfers to the Runtime the received value of QRP correctly, but it responds in activation confirmation (COT=7) with P/N bit set - so negative.

Solution

the Slave now responds command activation C_RP_NA_1 positive (COT=7 and P/N=0). It responds the command negative (P/N=1) only when received QRP value is out of range allowed in the Standard (e.g. when QRP=0) or when master uses wrong addressing (e.g. not existing sector).

Information




Issue Number: 31552
Fixed on Date: 17.3.2014
Versions: 6.51 0 BUILD 26 | 7.11 0 BUILD 11206