Help on using Siemens S5 IP242A counter card with FB183

[najafabadi]

Hi everybody, I try to understand an S5 program exists in an old machine. In this machine we have 2 IP242A counter card used for reading encoders. Refer to Siemens documentaries in the PLC program we should use FB178 and FB179 for programming of IP242A but in this system it uses FB183 for programming tasks. FB183 is the standard Siemens function block that use for IP242B (another counter module card). I try to simulate the system in other location but the system generates the error code 8 in the parameter F-NR of FB183 means "Module identifier is incorrect". I would be grateful if anybody can help me to find the reason. Also how can I obtain Siemens standard function blocks? Is it possible to change inside a standard function block? Best regards, B.Najafabadipour