标准和认证 Standards and approvals PROFIBUS EN 50 170, Volume 2 PROFINET IEC 61158 IEC 1131 IEC 1131, Part 2 UL Acc. to UL508 standard, File No. E 116536/E 75310 (AC modules) CSA Acc. to standard C22.2 No. 142. File No. LR 48323/LR 44226 (AC modules) cULus Acc. to UL 508 standard (for hazardous locations) File No. E 116536