The belgian site of Co-trust PLCs states that the Co-trust PLCs are compatible with S7 and VIPA PLCs (the main chinese site is not so explicit, or informative):

http://www.all-automation.be/N_frame.html?http://www.all-automation.be/Analoge-modules-N_grp_8_7-1.html

Here is a link to their Co-Trust catalog:
http://www.all-automation.be/TrustPLC_Kataloog.pdf, with this extract:

CTS7-200 PLC Overview

Easy to program

• Support IEC61131programming language
• Can be programmed by Step7-MicroWIN V4.0 of SIEMENS
• Support multinational programming language include LAD, STL and FBD
• Chinese/English programming
• Intelligentized help system
  
  
  Hope this helps,
  Daniel Chartier